The Use of
for Enforcement and Corrections
by John C. Desmedt
Copyright 1982, 1986, 1990,
1995, 2003, 2009 John C. Desmedt, All rights reserved
(NOTE: All references to "officer" and "law
enforcement" are intended to include: police, probation and parole,
corrections officers, and deputy sheriffs.)
We created the "Use of Force Model" concept in 1981, and began to
teach it internationally in 1982. Based on our concept and model, almost all
training concerns engaged in the use of force have developed variations of the
"Use of Force Model." The purpose of a use of force model is to
accurately guide a reasonable response for virtually any situation. The
"Use of Force Model" provides the "why" to everything we or
anyone teaches regarding the use of force.
"The development of the Use of Force Model by John Desmedt . . has
been of immeasurable assistance in litigating excessive force cases. The
ability to measure the use of force from a quantitative perspective has
revolutionized the litigation of excessive force cases. The application of the
Model, for the first time, allows the jury and the court to measure the term
"reasonable" in a truly objective fashion. The Model has been used
successfully in defending numerous police officers involved in constitutional
litigation in the Federal District Court . . ."
James R. Schirott and Charles E. Hervas, Attorneys at Law
The concept of "force continuum" or "escalation of force
continuum" generally refers to a listing of steps in the escalation of
force, a concept that has been around for quite a while. A
"continuum," however, should show a continuous change such as in a
traditional thermometer rather than an abrupt change in steps or stages.
Generally, use of force continua list alternatives in steps which are ordered
chronologically (i.e. which should be attempted first, and if that does not
work, which should be attempted next, and so forth).
This way of thinking, however, is not organized according to the reality and
implications of the use of force in the 1990's. In reality, an officer may enter
a situation which is already serious and immediate. The situation may escalate,
de-escalate, remain unchanged, or fluctuate quickly. Escalation of force only
deals with one of these conditions. While this may seem like hair splitting - it
is not. Understanding the quickly changing nature of use of force situations is
critical to developing the ability to respond correctly in a timely manner. In
times past, these abilities were not as critical as they are today. Today, the
officer must be trained to enter dynamic situations and use the probably
appropriate type and amount of force in a timely manner - that is, not too early
or not too late.
The purpose of a "use of force model" is to accurately guide a
reasonable response for virtually any situation. Overreaction may not only be
unconstitutional, it may also be ineffective. Underreaction may allow harm to
come to the officer or others.
In our opinion, it is important that the use of force be thought of as a
continuous stream of decisions and actions, appropriate in relation to the
subjects actions. Please refer to the attached article, "The Use of Force
Paradigm for Enforcement and Corrections."
The Use of Force Paradigm for Enforcement and Corrections not only lists
governmental alternatives, but ties probable appropriate use of force
alternatives to subjects actions. The model also shows degrees of probable
inappropriateness. A use of force model does not facilitate proper responses or
inhibit improper responses if it fails to show:
- the relationship between the subject's actions and the appropriate use of
force by enforcement representatives; or
- the continuous relationship (continuum) between enforcement use of force
Many use of force models in existence are derived from "The Use of Force
Paradigm for Enforcement and Corrections." We believe that our original
model provides the most valid, reliable, and practical guidance to the officer.
It is not just a theoretical training contrivance. It is a useful advisor.
In order to produce a valid model, it would have to be organized essentially
as our original model. We have found that other models (even those derived
directly from ours) do not actually serve to predict, guide, and analyze the
actual use of force in real life.
The tests for a valid use of force model are simple.
- Pick any situation involving a subject and describe the subject's actions
at one particular point in time. Referring to the model, attempt to find the
probable appropriate application of force. Or
- Pick any situation, describe the subject's actions and then describe the
officer's specific reaction. Referring to the model, attempt to quickly find
the degree of appropriateness of the officers reaction
If you can achieve either of these objectives clearly and quickly, the model
passes one test.
Second, decide whether the guidelines provided by the model seem logical and
consistent with relevant legal decisions, law enforcement trends, and with the
reality of life. If so, the model passes another test.
Third, is the model specific yet flexible enough to allow for reasonable
alternatives? It must be, or it cannot be applied to real life.
The original Use of Force Model provides the above listed advantages to all
concerned -to the degree of probability possible. It has and will remain valid
even through quickly changing technology as well as legal, and social
PSS has the capability to accurately measure performance, appropriateness,
timeliness, and effectiveness as the trainee performs alone and as part of a
team in situational simulations using the model.
This feedback enables trainees and instructors to focus on areas of weakness.
The same Use of Force Model can and should be used by inspectors and
investigators after actual incidents to analyze officer's actions according to
the "objective reasonableness" standard. As7 an indication of the
validity of this model, it was developed prior to U.S. Supreme Court decisions
applying the standards that The Model reflects, the first being Tennessee v
The Use of Force Model has also been repeatedly and successfully used in U.S.
Federal District Court. It has been challenged in the U. S. Federal Circuit
Court of Appeals. Therefore, The Use of Force Model is used as a training,
testing, and operational analysis tool, as well as an instrument for training,
operations, and litigation. It helps to insure that departmental policy is
consistent with the law, training objectives, content, methods, testing and
after-the-fact administrative actions These standards and factors also apply in
any country that employs the "standard of reasonableness" in their
Through the Use of Force Paradigm (Model), the reasons, considerations, and
limitations in the use of all measures of force for all occasions have been
ordered, categorized, and interrelated. The Use of Force Paradigm shows
congruent and incongruent cause and effect relationships, level of danger,
control difficulty, and force alternatives for the officer. This integrated view
is based on current technology and general social norms.
By using the Model, one need only accurately place any situation into one of
a few defined categories and match the proper category of response, instead of
attempting to match hypothetical situations, considerations, and opinions ad
infinitum. This concept of grouping situations into logical categories conforms
to the principles of educational psychology, assists officers in better
understanding the total use of force concept, and thereby helps them to respond
properly and promptly in times of acute stress. In fact, the Model has been
cited as an advanced technical application of educational psychology.
THE USE OF LESS-THAN-LETHAL CONTROL TECHNIQUES IN GENERAL
Since the middle l960's, much effort has been expended teaching enforcement
and corrections officers the use of verbal control - how to talk to and interact
with the public and other specific populations. Crisis management, sensitivity
training, and officer / community relations have become important segments of
almost all law enforcement training programs. The same is true for firearms
training. Officers throughout the nation must meet some degree of qualification
in order to carry firearms. These de facto standards do not exist for use of
less-than-lethal control methods, which include weaponless physical control
techniques. Several reasons exist for this phenomenon.
The use of weaponless and non-firearm control techniques requires the
touching and handling of the subject. Touching is, of itself, always a personal
act and an officer can never know what will happen when he lays hands on a
subject. Also, an officer must be within arms' reach to attempt physical control
of a subject.
This proximity is synonymous with vulnerability. The closer the proximity in
a confrontation, the greater the chance of being injured or embarrassed because
available reaction time can be reduced to a fraction of a second.
When an officer places his hands on a subject, another phenomenon occurs. The
officer may lose unconscious control of his balance. Control of balance becomes
a conscious effort since the officer is directly and mechanically connected to
the subject by the act of holding, pushing, or pulling, and therefore is
subjected to the effects not only of his own will, but also the will and the
movements of the subject. These phenomena do not occur while talking to or
shooting at a subject.
Less-than-lethal control methods are also perceived as less-than-reliable
control methods and therefore, always open to criticism. Use of less-than-lethal
force is the product of many variables. Fewer variables are involved in using a
handgun. For example, an officer cannot be criticized for carrying a handgun of
too large a caliber, nor for using too great a powder charge, too heavy a
bullet, hollow point vs. ball ammunition, etc. If these decisions are
pre-determined by the agency for which the officer works, such predeterminations
become a matter of policy.
Because less-than-lethal force may involve a great number of variables such
- physical stature,
- ability to withstand psychogenic shock,
- ability to perform and adapt skilled movements,
- knowledge of the expected outcome of mechanical actions,
- experience and drive in dealing with violence,
- ability to produce different types of force (discussed below),
- courage, and
- ability to control panic in acute emergencies,
the use of less-than-lethal control, is not absolutely quantifiable. The
result of the use of less-than-lethal force is a product of a chance gathering
of variables at a certain point in time.
Consequently, the officer's grip strength, hold, movement, technique (or lack
thereof), etc., may always be questioned. Agencies cannot write specific policy
concerning what "feels like" enough strength. The officer must
ultimately justify more performance elements with the use of less-than-lethal
force than with the use of lethal force. Due to the complexity, experienced
officers may have a general "feeling" or sense of the correct type and
amount of force, but this sense is vague and undefined. The faceless quality of
less-than-lethal force predictably leads to confusion and bad decisions (either
ineffective force or unnecessary force), in emergency circumstances. The officer
may very well be surprised when these actions are later found to be
inappropriate. The officer may be unable to adequately explain actions taken.
The fact remains, however, that officers must be able to clearly justify all
actions in which they use force no matter how complex the variables. Some
variables are subtle and go unnamed except by specialized trainers or
professors. Since the use of purely physical control is highly dependent on
personal variables that the officer brings to the situation, great disparity can
occur because officers are not at all equal in this respect.
"CONTROL" IS THE OBJECTIVE OF THE USE OF FORCE
To begin to understand the many concepts involved in the use of force, one
must first disassociate the strict concepts of offense and defense as the
primary justification of use of force techniques. Use of force is often thought
of and described in unspecific terms or in sports terminology. Unlike the
planned format of certain sports such as baseball and football where offensive
and defensive modes are separate, use of force situations are generally not as
clearly defined strictly in terms of offense and defense. The application of
physical force is more probably like the sport of boxing, in which a participant
- change from offense to defense during a movement, or,
- perform actions which are simultaneously offensive and defensive.
Therefore, to understand use of force, replace offense/defense with the
concept of control in your thinking. Control is the ability to command or direct
with or without voluntary compliance. Substitute the idea that the officer will
control with the subject's consent, if possible, but force the subject to
comply, if necessary.
One school of thought uses the premise that the role of law enforcement is
essentially defensive. What, however, is defensive about using force on a
subject who resists being moved or attempts to escape? Much attention has been
devoted to the quandary about shooting fleeing felons, until the landmark United
States Supreme Court Tennessee v. Garner decision.
In order to categorize these "offensively oriented" control
situations as "defensive," one must expand the meaning of defensive to
imply that chasing a suspect is, in the broader sense of the word,
"defending" society in general. The somewhat irrelevant and artificial
concepts of offense and defense do nothing to help an officer respond in an
urgent situation requiring action. The officer needs a clarification of murky
issues, not ideological pronouncements. Officers should not have to rethink
these definitions during each emergency, but they should be provided with clear
internal guidelines, a statement of purpose, and a principled philosophy as
embodied in the concept of "control."
The concept of defense (i.e. to protect from anger, harm or attack) is less
difficult to defend amidst the emotional issues involved in a use of force than
is the concept of "offense." The relevant definition of
"offense" is "attack" or "assault." Both of these
definitions carry the connotation of brutality, violence, and illegality. In the
military sense, assault is "the final stage of an attack that includes
close combat with the enemy." In the civil enforcement context, therefore,
we do not find that "offense" correctly describes the intent or goal
of legitimate force in overcoming resistance. "To compel" or "to
force" more correctly describes the appropriate reason for the use of force
other than to protect. When added together, "to protect" and "to
compel," (the basic reasons for justifiable use of force) become "to
As discussed, officers may use force when they need to establish and maintain
control over a subject. Therefore, the officer may use force to:
- stop an attack on the officer or others, or
- overcome resistance to lawful duties and tasks.
If the officer must make an aggressive or proactive action to seize a subject
who does not wish to be seized, the purpose of the seizure is to establish
control over the subject, regulating his movements for a legal reason. If the
officer is defending himself or another, control must be established over the
subject to neutralize the subject's capability to cause harm, but not
necessarily at any cost.
The cost to the subject in terms of injury or deprivation of liberty may not
outweigh the need of society to control the subject's actions. The governmental
need to control must outweigh the cost to the subject being controlled.
Therefore, the amount of force allowed to establish and maintain control must be
JUDGING THE USE OF FORCE BY SPECIFIC STANDARDS
Force is generally thought of in terms of quantity or "amount."
However, the probable general effect of force is also co-dependent on the
quality or type of force used. Types of force will be discussed below.
The correct amount of force is the amount of force necessary to establish and
maintain control over the subject, neutralizing threat or resistance.
The officer must be able to take the perceived data concerning the resistance
or danger caused by the subject and immediately match it with the most proper
available means of control. The officer must resolve the confrontation with a
minimum of injury to all parties concerned, and in a timely manner.
Since one cannot list all possible conflictive situations in detail, much
less match them with proper responses, situations can and must be classified by
major problem and by relative seriousness within that group.
As mentioned, the officer must act to control in a timely manner. That is, if
force is used, it must not be used either too early or too late relative to the
subject's actions. Timeliness is defined as being: "not too early or too
late to prevent physical injury, or to complete the legally authorized
task." Using force after danger or resistance has ceased is too late. Using
it before it is necessary is too early. Both are unreasonable. The element of
time is critical and must be factored in when determining the culpability of the
officer, based upon available alternatives.
Every incident in which an officer faces a subject is comprised of many time
frames just as each motion picture is comprised of picture frames. The motion
picture is a dynamic compilation of the individual frames. The use of force is a
dynamic compilation of time frames prior to, during, and after the actual use of
The officer must perceive and evaluate many factors which together dictate
the amount of time and the action alternatives available to the officer. Some of
these considerations are distance, shielding, obstruction and the type of attack
or resistance encountered, risk and probable affects on others. However we can
not author an all inclusive list. Even more to the point, the officer on the
scene does not have the reliable ability to accurately list all of the specific
considerations, just the most obvious. They, in turn, are only made obvious by
training or experience. Distance is one major consideration.
An increased distance from the subject allows the officer more time to form a
reflexive reaction movement sequence, evaluation, or considered opinion - in
ascending order. The greater the distance, the more time available for
perceiving situational clues more precisely, evaluating problems, alternatives,
and selecting the appropriate reaction in view of future implications. The
direct relationship between the subject's actions and the officer's actions is
bound by the reaction limitations of human physiology.
Similarly, environmental shielding and obstruction must be considered. If the
officer, and the rest of the community were shielded from all potential danger
the subjects might pose, the final decision to use force to protect from harm or
accomplish necessary enforcement tasks could be delayed indefinitely. A subject
with a knife serves as an example. If the subject is free-standing and
approaching an officer with raised knife, the officer MUST perform some
protective action at that time. If the same subject is locked in a basement with
no way out and knife raised, no protective action is required at that time.
Structural shielding gives decision-making time.
The modes of attack or resistance available to both the officer and the
subject also determine timeliness. If a subject held a truncheon and the officer
had no weapon, the officer would be forced to make quicker and earlier decisions
about means to control the subject's actions, than if the situation were
reversed. This is so because the officer must obey rules during a conflict; a
subject need not. All other things being considered, person versus person, the
subject enjoys many clear realistic advantages that account for successful
episodes of assault or resistance against officers. Both sides of a conflict
possess some means to attack or resist each other. Because the officer's reasons
for using force are legally mandated or allowed, they are also restricted.
Having placed the officer in this permanent situation, the government should
provide the officer with all necessary instructions, equipment, and tools to
control, given the time available. The tradition has been quite the opposite,
Officers are often given only a firearm, the advice, "use good
judgment," and unclear policy designed not just to guide the officer, but
to protect the agency by allowing certain ambiguities, which the officer is
supposed to judge, given the totality of the circumstances. Unfortunately
firearms are restricted from use in most situations, and the quality of the
"good judgment" is always determined after the situation has ended,
when the officer is judged. Officers should not have to gamble that the use of
force, if successful, will be considered an offense in itself. Greater
guarantees should be provided to the officer - certain "limited"
guarantees as to what does and does not constitute a reasonable use of force.
Each of the subject's actions and the correlating officer reactions are
ultimately subject to scrutiny. They may be judged for legality or
reasonableness within frames or points of time.
The perceptions of the officer are also subject to judgment. Perceptions,
however, also must be judged according to timeliness. That is, the shorter the
time period involved, the faster events occur, and the more confusion present in
the environment, the less accurate the officer's probable total perception will
be. Yet, typical depositions and testimonies of officers involved in use of
force cases include questions and answers such as:
"Officer, when the subject came toward you with what you say was a
revolver, how were the fingers of his left hand positioned?"
"I don't recall."
"Officer, as the subject was striking at you, in what position was he
"I don't recall."
"Officer, did you actually see that the firearm was loaded?"
"I don't recall."
"Officer, how many people were in the back seat of the car when you
started pulling them out?"
"I don't recall."
Human perceptions are limited by scope, amount of information taken into
account, and time. Therefore, mistakes in perception and resultant mistakes in
actions are not just probable, but predictable. Given that no human can be aware
of all occurrences in the immediate environment, some allowance must be made for
this human imperfection, even in the most serious cases. The officer should not
be judged for acting upon an imperfect data base if other responsible officers
in the situation may have come to similar inaccurate perceptions.
For example, an officer shot and killed a subject who suddenly pointed a
squirt gun at the officer. This occurred on the well-lit warehouse roof top. The
officer realized that the gun was a toy, but only after he had shot the subject.
Only after the situation allowed him time to clarify this perception with more
specific information did the officer realize that the gun was a squirt gun.
If the officer were judged by other than a reasonable perception standard, he
would have been guilty of shooting an unarmed subject, because he did. However,
because of the officer's inability to perceive perfectly, (according to his
perceptions) the subject was actually armed and about to shoot.
An officer's actions must be judged on perception, not on absolute fact. The
training standards for judging the use of force and standards for judging the
actual use of force should be synonymous. They must allow latitude both for
errors in perception and for less-than-perfect performance of complex open
WHAT THE MODEL REPRESENTS
Looking at the Model, the vertical line AB represents situations the subject
creates by his actions. At the bottom of line AB, the subject's actions are not
threatening or illegal. Therefore, the officer does not possess the degree of
discretion to impose himself on the subject's life.
Angle D (with irregular lines) represents the ultimate in criticality. The
subject is threatening to cause death or serious bodily injury. Available time
is scarce in these situations, therefore discretion has been allowed by the
United States Supreme Court and is reflected by the Model. At the extreme, an
officer is allowed to use lethal force if the subject is about to kill (at the
top end), or cause only serious bodily injury (at the lower end). Since this
model was originally published, the United States Supreme Court validated this
concept in Tennessee v. Garner.
THE SUBJECT'S ACTIONS
To measure and analyze actual situations in which force was used, may have
been used, or should have been used by the officer, one must perform these steps
- Determine and list the actual sequence of subject/officer transactions
during the entire situation in chronological order with the greatest degree
of accuracy possible.
- Determine the criticality level of each of the subject's actions and the
correspondent officer reaction.
Since the threat / resistance level of the subject's actions, as perceived by
the officer at a specific time, determines the necessary type and amount of
force to be used by the officer, the first step in determining the appropriate
use of force at a given situational time frame in all cases is to determine the
level of the subject's resistance or threat. Previous data concerning the
subject's propensity for violence may be taken into account when establishing
the initial response level - if time exists for such planning.
On the Model, point B is the neutral point on the vertical axis (line AB) at
which no problem exists. Rising up line AB from point B to point A, one sees a
continuous increase in the level of resistance or threat by the subject(s),
along with an increase in the difficulty to control the subject's actions, in
the danger he presents and the vulnerability of the officer. In short, the
higher on line AB, the more critical the situation caused by the subject's
Subject actions are classified on the scale of criticality by:
- the amount of difficulty necessary to control them and,
- the seriousness of the probable effects of the actions in terms of injury
Just above point B, only distance links the officer and subject. That is, the
nearer the officer to the subject, the less time the officer will have to react
to subject actions. Therefore the more difficult the subject's actions will be
to control. The closer the officer to the subject, even if apparently
cooperative, the more the officer must begin to notice the situation for
safety's sake. At the point of no overt resistance or threat, the presence of
the officer is enough to control the subject since the subject is offering no
Any possible actions by the subject can be grouped into categories which
require response from the enforcement representative. Hidden and integrated in
these category definitions are the prime elements of physical conflict dynamics
such as: amount and type of force, degree of movement, size and weight variance,
degree of muscular tension, relative positioning, fear, motivation, duty
requirements, subject, officer, and weapons capabilities, presence of weapons,
countervailing properties of officers' alternatives, numbers of officers and
subjects, faulty sensory perception, medical implications, generally accepted
appropriate goals of law enforcement agencies, legal considerations, and the
anaerobic capacity of the officer. To appreciate the significance of the
categorical elements, one must analyze each category in the context of the
others. In effect, the elements of control are applicable on several different
The least critical subject behavior as shown on line AB, a cooperative
subject is one who, regardless of level of risk posed, complies with the
officer's appropriate non-verbal, social cues or verbal direction. Cooperative
subjects are divided into two categories.
1. LOW LEVEL COOPERATIVE SUBJECT
The lowest level of subject in terms of difficulty to control and/or
threatened danger is the cooperative subject, who complies with appropriate
non-verbal cues, such as behaving appropriately in the presence of an officer in
routine situations. One example is the subject who steps aside when an officer
(or anyone else) obviously intends to walk past. Another example is the subject
who surrenders to the officer on sight, without the necessity of verbal
direction. The subject's actions are self-initiated, but virtually paced by the
officer or others.
Distance is the key element in determining the level of difficulty in
controlling within this category of subject behaviors. As distance between the
officer and the subject decreases, so do the officer's alternatives for
establishing physical control should the subject suddenly attack or resist the
officer. The increasing vulnerability at closer ranges must be taken into
consideration even though the subject(s) may appear to be cooperative, and use
of verbal direction seems unnecessary. Therefore, "the closer to the
subject(s), the greater the relative risk" - even from an apparently
cooperative subject, who needs no verbal direction.
2. HIGH LEVEL COOPERATIVE SUBJECT
Within this category of subject actions, the subject responds to verbal
direction. Criteria for inclusion in this category are that the:
- use of verbal direction is necessary for the officer to elicit the
cooperation / compliance of the subject,
- subject responds to verbal direction in a timely manner.
The subject's level within this category is based mainly on amount of risk
that the subject creates. Proximity is one factor in determining risk.
- The higher the perceived risk based on knowledge of the subject's previous
behavior, observed mental state, attitude, or physical actions, the higher
position within the category.
- The closer the subject to the officer or others, the higher the position
with the category.
A subject controlled by verbal direction may, an instant later, become a
highly dangerous assailant by virtue of his actions. The officer must,
therefore, take precautionary steps to ensure that force alternatives are
available for use instantly. Even the actions of cooperative subjects must be
controlled to the degree that, should they suddenly become assailants or
resisters, they begin their assault or resistance from disadvantaged positions
relative to the officer.
Resisters are subjects who do not respond to social or verbal control, but
who do not act as assailants. Resisters are more difficult to control than
cooperative subjects. They must be seized and physically compelled to cooperate.
Two levels of resister exist, they are the passive resister and the active
1. NON-MOVING RESISTER
Degrees of passive resistance (refusal to move as directed) can be measured
- degree of muscular resistance of the arm to the touch of the officer and,
- distance from the subject's hand(s) to the subject's lower abdomen. (The
closer to the pelvis, the greater the efficiency of the musculature of the
arms to resist against external forces of pulling, twisting, or rolling by
This category of subject behavior does not include attempts to flee or to
create greater distance between the subject and the officer. The subject simply
tries not to be moved. A subject may increase ability to resist passively by
grasping a fixed object.
The passive resister is more difficult to control physically than even a
highly dangerous cooperative subject, because physical force must be used on the
passive resister if he is to be controlled, whereas the dangerous cooperative
subject's actions are controlled without application of physical force. As
previously stated, the subject's actions determine this level of difficulty to
control, not simply the fear he creates in the officer or others.
2. MOVING RESISTER
This subject resists by moving to avoid
physical control by the officer and create space between the officer's reach and
himself. This type of resistance ranges from slight evasive movement of the arm,
through flailing, to full flight. The active resister coordinates his behavior
to create distance between the officer and his own body or body parts. Active
resister behaviors are not harmful, merely difficult to control.
Assailants are grouped into three categories according to the probable harm
their actions may cause.
1. ACTIONS ARE AGGRESSIVELY OFFENSIVE WITHOUT A WEAPON
In this category of subject actions, the subject closes distance from himself
to the officer, usurping the officer's personal surrounding space, limiting the
officer's available alternatives, and taking control of the situation from the
officer without actually or potentially harming the officer at that point in
time. The subject attempts to make physical contact with the officer.
The specific actions of this subject will probably not cause immediate
physical injury to the officer, but may create a situation in which the officer
may have neither the time nor resources to react properly in defense of self or
The officer may be under the physical control of the subject so that the
officer may not be able to control his own body positioning reliably. By his
actions, even without causing injury, the subject places the officer in fear of
losing all force alternatives as they diminish.
2. ACTIONS WILL PROBABLY CAUSE PHYSICAL INJURY
This category of subject is defined by actions which attack the officer or
others. Because of the mode of attack, the injury will be less than
"serious" physical injury. Probable physical injury may include minor
broken bones, sprains, scrapes, contusions, cuts to the skin, or damage to the
teeth, or hair. This type of injury is usually found in weaponless fights.
3. ACTIONS WILL PROBABLY CAUSE DEATH OR SERIOUS PHYSICAL INJURY
The actions of this category of subject give probable cause to believe that
the subject will immediately cause death or serious physical injury. For the
sake of clarity, serious physical injury may be viewed as:
- a major broken bone,
- a gaping (widely opened or separated) wound, or
- damage to internal organs.
This definition differs from the lesser classification of "Actions will
probably cause physical injury." "Serious physical injury" has
been defined as injury which would necessitate a prolonged hospital stay or
cause a marked decrease in the permanent quality of life. However, if the
officer does not happen to be a physician or a fortune teller, he will not be
able to predict the length or degree of anyone's recuperation. Therefore, we
classify serious physical injury in tangible terms which the officer can use in
formulating judgments prior to experiencing the outcome of subject actions.
The specific way in which the subject may cause death or serious physical
injury is immaterial except as it affects timeliness of the officer's reactions
or as it lessens the officer's alternatives in producing a reaction. For a
subject to be placed in this category, he could be using a firearm, bomb, acid,
vehicle, or brick, as long as the mode and weapon are capable of causing
immediate serious physical injury. This type of force is termed "lethal
force." This is the same definition as the lethal force used by officers.
Considering all of the officer's available alternative control options, line
BC on the Model represents the officer's means of establishing control. These
means are not ordered by frequency of occurrence or chronology, but by intensity
and severity within each category. As line BC progresses from point B to point
C, the probability of establishing control of any subject increases, but so does
the chance of causing physical harm to the subject. This relationship as well as
the basic control option groups available to the officer are discussed below
beginning with "Social Control."
Social control is the deterrent effect produced by the presence of others The
presence of others increases the possibility of sanctions for improper actions.
Anyone's mere presence can serve as a form of control. "Presence" as
we use it primarily means the proximity of the personification of legal
authority, and secondarily, the degree of intimidation caused by physical
stature or other signs of the ability to use force.
To gain the status of officer presence as opposed to the presence of
just another citizen (witness), the officer must be identified as an officer,
either via uniform or some other means. Since officers possess authorities which
other citizens do not, the identification of the officer is critical to
establishing a special presence, which in turn brings to mind an enhanced need
to conform with social regulation.
Additionally, if the officer is of considerable size, exhibits an alert
demeanor, and looks generally fit, the lowest level of the effect of the
officer's presence moves to the right on the Model, because the officer has
already attained psychological advantage. You can expect that the presence of
several officers will create a greater deterrent than the presence of one. Too
much presence, on the other hand can evoke the down-side of panic and fear in
the subject. The fear increases hostility which, in turn, can actually
precipitate an attack or resistance.
The component of social control may, at any place on the continuum of subject
actions, suddenly cause the subject to come to the realization that he should
abandon his resistance or assault. However, the higher intensity of the
subject's resistance or attack, the less likely he will be stopped or controlled
merely by presence. Holding up a badge, identifying oneself, and commanding,
"Stop," will probably not stop the actions of a highly motivated
Social control alone produces very limited probability of positive control.
If this were not true, very few people would ever resist or attack anyone who
they knew to be an officer. Even though social control is not effective without
use of physical control against most subject classifications, officers must
establish their identity and presence along with all forms of physical force. On
the Model, the probable control effect of social control is shown by an area
with fully clear background below line BC. Those areas in which social control
must be used along with physical force are shown by partially clear and
partially shadowed background.
The next category of control option is "verbal control" or verbal
direction. Verbal control may range from a smiling "Please," to
"Stop, or I'll shoot!" Verbal direction (advice, persuasion and
warning) may seize the subject's malicious intent at any place within the
resistance / attack continuum of his actions. Once again however, the more
intense the subject's resistance, the less probable that words alone will
suffice to control, unless there is time to establish dialogue or negotiation
and delay or avoid the use of physical force. In the continuum of control
alternatives, a point exists at which words prove fruitless when used without
physical control. Verbal control operates similarly to social control, but at
different points on the continuum. Like social control, verbal control must
be used with all forms of physical control. On the Model, below line BC, the
probable effect differential between verbal control alone and verbal control
used with physical control is depicted in the same manner as are social control
alone, and social control with physical control.
DUAL MODES OF SOCIAL AND VERBAL CONTROL
Social control (presence) and verbal control (talking) can and should be used
along with physical controls, when higher level controls are necessary. Verbal
control has not generally been considered an element in the application of
physical control procedures. We believe that it should be.
One reason for this is that officers (and everyone else) can only concentrate
on one endeavor at any point in time. Officers may encounter ample difficulty
controlling with physical force. However, if trained to talk while using
physical movements as one reaction, the officer can many times cause the subject
to discontinue resistance simply by calling the subject by name, or by giving
commands while using physical force.
Weaponless control is one mode available with which to apply physical force
against those subject actions which words do not control, but which will
probably not cause serious physical injury or death. In the Model, we have
divided weaponless control into three categories. They range from least
probability of control and least injurious, to the greatest probability of
control, but with the greatest probability of resultant physical injury to the
subject. These categories are discussed below.
1. HOLDING (PRESSURE
Pressure and pain producing holds consist of the application of non-impact
pressure to pain receptors, such as wrist locks, hair pulling, pinching or
pressing on "pressure points" (areas of the body which are
pain-sensitive to application of mechanical pressure). We assign the term
"Pressure Sensitive Area" to these areas of the body, since they are
more small "areas" than "points," and should not be confused
with pressure points used to stop bleeding. Applying mechanical pressure causes
control by establishing an overwhelming desire in the subject to find relief
from the pain, either by stopping all resistance (when being held from more than
one direction) or by propelling him in the direction of relief allowed by the
officer (when being pressured from a single direction). However, the outcome of
the use of pressure or pain producing holds (wrist locks or applying pressure to
pressure sensitive areas of the body) is not always predictable.
Reaction to pain is highly unpredictable because the quality of pain varies
widely between subjects and between body parts. Pain threshold and pain
tolerance levels are greatly affected by mental state, drugs, past experience -
even time of day. A highly motivated subject may not even realize that he has
been shot, much less be controlled by a deep push of fingers into an area pain
sensitive to such pressure. These pain-sensitive areas of the body are not
usually sensitive because major nerves themselves are exposed, but because pain
receptors (sensors) indirectly connected to main nerves are stimulated.
When stimuli from pain sensors, is measured in the brain, the subject
experiences the sensation of pain as if the pain were actually occurring at the
site of the hold. Actually the pain itself is being produced in the brain, which
is stimulated by signals from the affected body parts. However, many other brain
activities can block the transmissions of the pain message. This automatic
ability to block the pain message makes pressure / pain holds an unreliable use
of physical force through which to establish control.
Characteristics of Pressure Holds are:
- low probability of physical injury to the subject,
- unpredictable effect on subject - may not control at all.
When pressure is exerted to move a joint beyond the range of motion and
initiates injury, damage to muscle tendon organs, bones, or ligaments, the force
then moves out of the "holding" classification into that of Prohibitive
2. DIFFUSED PRESSURE STRIKING
Diffused Pressure Striking is used to interfere with the subject's ability to purposefully
direct his attention toward producing coordinated resistance to the officer. If
the subject is disoriented, his ability to react in a coordinated manner is
diminished. Temporary inhibition of respiration, diminished functional
capability of the arm or leg muscles, or the inability to concentrate mentally
are forms stunned reactions. Examples of Diffused Pressure Striking are:
- a palm heel strike to the head,
- a strike to the lower rib cage, or the solar plexus, or
- strikes to large muscles of the arms and legs.
The use of Diffused Pressure Striking can stop the movements of active resistance and give the
officer the opportunity to apply "holding" techniques, handcuffs, or
other restraining devices to the previously active resister.
Impact pressure is purposely diminished when attempting to stun, so that
force is spread over a wider surface area of the subject's body. This lessening
of the pressure created by a given amount of force changes the quality of effect
from sharp penetration and breaking, to padded shocking and temporary
disruption. In some cases softer parts of the officer's body are used as weapons
and, in other cases, softer parts of the subject's body are targeted. Either
combination can reduce the amount of impact pressure from a strike.
Characteristics of Diffused Pressure Striking are:
- some probability of physical injury to the subject,
- more reliable than pressure holds,
- easier to apply than pressure holds,
- temporary effect.
3. DIRECT MECHANICAL APPLICATIONS
Direct mechanical applications are those which use mechanical impact pressure
or leverage directly against the mechanical support structure (skeleton) of the
subject's body. The mechanical mode differs from holding and Diffused Pressure
Striking in that
the support structure of the subject's body is the target, not the subject's
ability to pay attention or use particular muscles. Either impact pressure or
opposing prohibitive pressures are used.
Prohibitive pressure is pressure applied to bones and joints which take them
beyond their normal range of motion and movement tolerance to sprain,
dislocation, or fracture. Any direct mechanical techniques can fracture bone or
cause damage to connective tissue, muscles, or organs. Direct mechanical
methods generally offer the best chance for establishing physical control of
a subject, but also carry the greatest chance of injury to him. Techniques in
this category include:
A. CONCENTRATED IMPACT PRESSURE
Impact pressure is non-firearm generated pressure in which the instrument
used, such as the fist, a baton, etc., is propelled into the target, as opposed
to "thrust pressure" in which the instrument touches the target and
then develops speed.
Concentrated impact pressure is intended to penetrate into tissue to a depth
sufficient to stop an attacking subject by causing internal body components to
stop functioning as supportive mechanisms of attack.
B. PROHIBITIVE HOLDING PRESSURE
This type of non-impact pressure differs from pain / pressure holds.
Fractures, dislocations, sprains, and bone, tendon, or ligament damage may
result when massive pressure or weight is applied after a joint lock is fully
established. The body part in question may no longer retain the capability to
continue the attack.
An example of techniques in this category is the piling-on of bodies or other
massive weight on a subject to the extent that he is unable to move - sometimes
to breathe. Another by-product of piling-on may be prohibitive joint movement
with resultant damage to joints, muscles, or bones.
C. NECK HOLDS
Neck holds, such as vascular or choke holds, are forms of
high-risk-mechanical techniques. Vascular neck holds are not the same as choke
holds. They are two distinct types of control with different potentials for
causing physical damage. Both operate by means of squeezing neck and throat
organs in a vise-like mechanical action of the arms. Since it is unlikely that
neck holds can be applied from a face-to-face position with an assailant, they
are more probably useful against a low-level resister. Neck holds are not
reliable techniques for controlling assailants. The techniques do, however,
carry severe possible consequences for subjects upon whom they are used and
secondarily, the officer who uses them. Choke holds are inherently more
dangerous than vascular holds.
Definitions of the two holds are often confused. The reason for this error is
that both techniques appear similar in execution, are applied to body parts in
close proximity, and if not performed properly, one may unintentionally turn
into the other.
Vascular-type neck holds are meant to establish control only by changing the
rate of blood flow mainly from, but also to, the brain. The change in pressure
can cause pain, confusion, and can alter the rate of functioning of internal
organs, including the heart.
Choke holds, however, constrict the flow of air to the lungs and may cause
other undesirable side effects such as damage to throat cartilage. This damage
may very well be salvageable only by surgical procedure which may not be
accomplished in time to save the subject's life.
The range of mechanical techniques could also include most military combat
techniques (unconventional for civilian use) at the lethal force end of
mechanical controls. Although these unconventional techniques are not usually
taught in law enforcement academies, they are also examples of the high end of
this weaponless control mode.
Characteristics of Direct Mechanical Techniques are:
- the greatest probability of physical injury to subject of all weaponless
- the greatest probability of forcible control of all weaponless control
- the most irreversible of weaponless control techniques.
Use of impact weapon techniques (various types of truncheons such as batons,
etc.) begins at the same point on the continuum as mechanical weaponless
techniques. An impact weapon is one used to establish control of an assailant
through non-firearm generated impact pressure to the subject as described above
under "Weaponless Control - Mechanical." Batons or other impact
weapons can be used with various degrees of intensity. As the matching category
on the vertical axis would indicate, if a subject is aggressively offensive to
an officer or others, even without the use of a weapon, applying an impact
weapon with the necessary level of intensity to less vulnerable body targets is
appropriate in lieu of attempting weaponless mechanical physical control.
If a subject is likely to harm others, more intense baton usage would be in
order. If the subject immediately threatens life or serious physical injury, the
baton may be useful, but its potential does not match the probability of
establishing the instantaneous control that a firearm offers.
The use of the impact weapon as well as other methods which avoid direct
physical contact, has gained greater importance since the onset of AIDS. If
striking an assailant becomes necessary, using the impact weapon instead of an
officer's body part reduces the chance for accidental contact in which white
blood cells may be transferred from the carrier of the deadly disease to the
officer. Impact weapons should not be considered a higher level of force than
weaponless direct mechanical control. Weaponless control can cause as much or
Control Instruments are tools which are designed to apply non-impact pressure
to pain sensors, mainly in the skin and covering of the bones (periosteum),
thereby establishing control over subjects who passively resist. The use of a
control instrument, such as the Yawara, or other short stick-like instrument
when correctly applied, can increase the chances of establishing control by
amplifying non-impact pressure. These instruments are not impact weapons. They
are designed to maximize pain, but when used strictly as control instruments,
produce little probability of causing physical damage.
Using control instruments for creating pain simply to gain information is not
ethical, but is a form of torture. Using control instruments to avoid using
another more probably destructive form of control, such as striking, is ethical.
The officer must cease producing pain immediately when the subject ceases to
resist. Use of control instruments is classified synonymously with pressure /
pain producing holds.
ELECTRICAL SHOCKING DEVICES
As of now, harmless electrical shocking devices are not capable of reliably
stopping the highly motivated assailant or resister. Those shocking devices that
are designed to be used while holding onto a subject can only be used when the
subject is already immobilized or not actively resisting. They offer a
negligible probability of Diffused Pressure Striking, but do cause pain and burning of the skin.
Those shocking devices which are "shot" from a distance are limited
in the number of attempts that can be made in a short period of time. Their use
requires follow-up medical attention. Thick clothing can dampen the desired
effect. Manufacturers are working to develop the electrical shocking device into
a reliable and useful tool. At present, those devices which are reliable (such
as the cattle prod), are also dangerous. Those which cause minimal injury are
also predictably unreliable.
Commercial chemical agents used for enforcement purposes are almost always
non-lethal. They require some time to take effect, and the resultant effect on a
subject is unpredictable. Therefore, conventional chemical agents are generally
useful on subjects who resist, but who are not actually assaulting at close
range. When treated properly after use, the subject, on whom the chemical agent
was used, maintains a low probability of physical damage. Claims that
conventional chemical agents can immediately incapacitate even enraged subjects,
or subjects under the influence of drugs are unfounded. This includes capsicum
THE RELATIONSHIP OF CONTROL OPTIONS
As one proceeds from point B to point C on the Model, three relationships
develop. The more critical the control mode or technique:
- the greater the probability of officer control. The greater the
probability of establishing control, the greater the advantage for the
- the greater the probability the subject will receive injury. The greater
the probability of physical injury to the subject, the greater the
disadvantage to the officer. The most desirable situation would be one in
which the officer could reliably control the subject without injury to him.
This is so, due to legal and administrative consequences for the officer.
When the subject cannot demonstrate injury, the liability of the officer and
agency is reduced.
- the less reversible the officer's actions become. The irreversibility of
an action is a liability to the officer. It is difficult to undertake an
action which can produce serious consequences and, from which there is no
return. The outcome (damage) of lethal force is almost always serious and,
therefore, cannot be taken back or reversed. The less reversible the
actions, the more reluctant officers should be to use them. Mistakes in the
use of irreversible action are permanent mistakes.
Therefore, near one end of the continuum is verbal control, which will not
harm the subject and is reversible - it can be taken back without injury.
Mistakes carry no great penalty. Verbal direction does not, however, generate a
great probability of controlling an assailant.
On the other end of the continuum, use of the firearm gives great probability
of control. However, it also causes great probability of damage to the subject's
body and, therefore, carries a high degree of potential liability. It cannot be
"taken back." Officers may not discharge firearms without serious
potential consequences, no matter how mistakenly.
HOW THE MODEL DISPLAYS REASONABLENESS
To summarize its construction, the Use of Force Model is formed by the
positioning of two perpendicular axes. The vertical scale, line AB, represents a
continuum of possible actions and situations which are determined by the
subject(s) with whom the law enforcement officer is involved.
In using this model, the vertical level of the subject's action is always
determined first, since it is the action of the subject which determines type
and amount of immediate force to be used by a law enforcement officer to compel
This continuum is divided into general groups by lines to help the user
determine where, on the continuum, the subject's action belongs. Actually, the
lines should not be present to delineate steps, but the vertical axis should be
progressively shaded - from point B to point A, thus indicating a continuum. The
level of threat / resistance created by the subject(s) actions is equated to the
level of control difficulty and/or danger the officer faces.
The horizontal scale, line BC, represents the use of force by a law
enforcement officer. The beginning and end of each category of control options
is defined by a line.
As explained earlier, moving from point B to point C, control options
- probability of establishing positive control,
- probability of creating physical harm to the subject(s), and
- irreversibility of the action.
Individual agencies could conceivably mark the beginning point of each type
of control to correlate with their use of force policy. However, altering the
Model will not alter the reality of use of force relationships. If some control
means are not available within various agencies, they may be covered over.
However, geometrical relationships must not be changed.
The graph is traversed by line BD, which represents the ideal use of force.
The irregular area represented by Lines BD1 and BD2creates
a discretionary "gray area" (D) within which the officer's actions are
acceptable when judged strictly by probability of control vs. probable physical
injury. Area ABD represents potential ineffective control or response. Area CBD
represents potential excessive control or response. One can see that some points
within these areas are closer than others to the acceptable range of the
irregular area of D. They are meant to be, and represent proximity or divergence
from the probable proper use of force.
HOW TO ANALYZE APPLICATION OF PHYSICAL FORCE
This model can be used for both pre-incident training and post-incident
evaluation. If a situation is complex, characterized by fast changing levels of
threat/resistance and reaction, then its course may be plotted on this model by
numbering each subject action and officer reaction, chronologically on the Model
(e.g., l. This happened first; 2. This happened second; 3. ...etc. See Figures 2
TO FIND THE PROPER USE OF FORCE
To use the Model in training for determining the appropriate level of force
an officer should use in response to demonstrated threat / resistance follow
- Determine the position of threat/resistance on the vertical axis AB.
- At that level, strike a horizontal line to the 45 degree center line BD.
- At the point where BD is intersected, strike a line straight down to the
horizontal axis BC. The intersection point on the horizontal axis is the
proper use of force in any of the categories of officer control.
TO EVALUATE THE USE OF FORCE
To use the Model in situational analysis for determining in retrospect
whether an officer reacted appropriately:
- Determine the level of threat/resistance on the vertical axis.
- At that level, draw a horizontal line to the right edge of the graph.
- Determine the level of control used, and mark it on the horizontal axis
- At that point, draw a vertical line upward until it intersects with the
line drawn in Step B.
- Repeat for all actions taken in order, and label each intersecting point
in chronological sequence (See "Case Study" below).
INCIDENT ANALYSIS UTILIZING THE USE OF FORCE MODEL
The following rationale is followed when utilizing or teaching the
Use of Force Model.
Situations requiring force lie on a continuum from neutral to as serious as
An infinite number of possible situations exist. No situation is exactly the
same as another.
The purpose for the use of force is to establish and maintain lawful CONTROL
(not defense or offense). Control is defined as the ability to compel, command,
or direct with or without the cooperation of the subject.
Force may be used to establish and maintain control for either or both of the
following reasons. To:
- protect from harm, and/or
- overcome resistance to lawful functions of the enforcement representative.
The subject's actions necessitate the quality and quantity of force used by
the enforcement representative.
The officer / agent possesses some or all control modes which can
be categorized using the following hierarchy:
- Social Control (person)
- Verbal Control
- Weaponless Control Techniques (including Pressure / Pain Holds - starting
at "hands-on" with no pain; Diffused Pressure Striking, Mechanical (Direct
Impact or Prohibitive Holding)
- Electrical Shocking Devices (roughly equivalent to weaponless pressure
- Chemical Agents
- Control Instruments (equivalent to weaponless pressure / pain holds)
- Impact Weapons (equivalent to weaponless mechanical modes)
- Firearms (and other means of force considered to possess the probability
of causing death or serious bodily damage when utilized)
As one uses higher categories of means of control, several effects
will probably occur:
- The likelihood of establishing and maintaining control is greater,
- The likelihood of tissue damage is greater, and/or
- The means of establishing control is less reversible.
Categories of means of control can be matched with their probability of
controlling the subject's resistance/attack. If a control mode is not available,
use of the remaining modes does not change.
Each mark on the respective chart shows the relationship and probable effect
of each use of force transaction. In order to find the probable correct action
(if the nexus of the subject's action and the officer's action does not fall
within the probable appropriate range), extend the level of subject action to
line AD. Strike a line downward from the intersection of the level of the
subject's action and line AD. The line will run directly through all actions
which are probably appropriate to control the subject's actions.
- The subject is standing facing the officer.
- The subject suddenly charges the officer, striking him in the face and
chest with his fists.
- The subject continues to strike the officer in the face and chest.
- The subject falls unconscious
- The officer informs the subject that he is under arrest and verbally
directs the subject into a position for handcuffing.
- The officer yells at the subject to stop and tries to radio for help
(while being hit).
- The officer draws his handgun and shoots the subject.
- The officer handcuffs the subject.
- The subject is sitting on a chair.
- The subject holds onto the chair tightly and draws his arms and legs
closely toward his abdomen in a seated fetal position.
- The subject remains in a tight fetal position.
- Officer A tells the subject several times that he is under arrest and to
extend his arms straight back behind the chair.
- The officers grasp the subject's upper arms and try to pull them away from
- Officer A strikes the subject in the arm with the baton.
- Officer B continues to pull on the subject's upper arm.