Distance, Cover, and Tactical Positioning | Edged-Weapon Response Lab

A federal-law and policy backgrounder on distance, cover, tactical redeployment, the Tueller Drill, time-and-distance concepts, and whether officers must retreat, wait, close distance, or reposition before using force.

Law & Policy entries explain legal standards, case law, and policy frameworks. They are analytical backgrounds, not legal advice.

Overview

A recurring question after a police shooting concerns why the officers did not simply wait. Closely related questions ask:

Why did they move closer?
Why did they leave cover?
Why did they not back away?
Why did they not contain the person?
Why did they approach someone holding a knife?
Why did they not wait for backup, a negotiator, a shield, a CEW, or a tactical team?
If the person was twenty or thirty feet away, why was deadly force necessary?
Conversely, if the person was rapidly closing distance, why should police have waited until physical contact?

These questions implicate several overlapping concepts: distance; cover; containment; tactical positioning; redeployment; retreat; time-and-distance tactics; the Tueller Drill and its associated training shorthand, often called the “21-foot rule”; officer-created jeopardy; and the distinction between poor tactics and a constitutional violation.

The governing constitutional rule is neither a categorical command to retreat nor a categorical command to advance. A more accurate formulation is that the Fourth Amendment generally does not impose a categorical duty to retreat, seek cover, or wait before using otherwise reasonable force, but that the absence of a retreat duty does not make an officer’s tactical choices irrelevant. Depending on the jurisdiction and facts, available cover, distance, time, containment, and an officer’s decision to close or maintain distance may form part of the totality of circumstances, expert testimony, policy analysis, or officer-created-jeopardy inquiry. This makes the subject especially important in edged-weapon encounters.

No Federal Constitutional Duty to Retreat

Federal excessive-force doctrine does not generally impose a categorical requirement that a police officer retreat before defending against an imminent threat. Courts have repeatedly recognized that an officer facing immediate danger need not turn and run, surrender a tactically useful position, abandon a civilian, leave another officer exposed, or wait until an attacker physically reaches them before using otherwise reasonable defensive force. That principle does, however, carry an important qualification: no duty to retreat is not the same as automatic authority to use deadly force, and the force must still be objectively reasonable under the totality of the circumstances.

Stewart v. City of Euclid: No Duty to Retreat Does Not End the Analysis

(Stewart v. City Of Euclid, 2020), states the distinction particularly well. Officer Rhodes entered a vehicle during an encounter and later used deadly force against the driver. The Sixth Circuit held that having no duty to retreat does not mean the officer could use deadly force, because the force still had to be reasonable under the circumstances, and the court further observed that both the officer’s decision to enter the vehicle and the availability of an exit could still speak to the totality of circumstances. The court did not create a constitutional duty to exit; instead, it recognized that the existence of a safer available position can be relevant without becoming a mandatory prerequisite to force – a distinction central to this Backgrounder.

No Duty to Rush Forward

The converse proposition is equally important. There is no general federal rule requiring an officer confronting a contained person to immediately close distance, immediately enter a room, immediately cross open ground, immediately force physical contact, or immediately resolve a static crisis. Where no civilian is presently endangered, the person is contained, the weapon is self-directed, barriers exist, officers have cover, and time is available, waiting may be tactically possible – though whether waiting is constitutionally required is a separate question, and the Fourth Amendment does not ordinarily constitutionalize the tactically best possible response.

Time as a Tactical Resource

Time can change an encounter, and maintaining distance can allow:

more information to arrive;
additional officers to respond;
a supervisor to coordinate;
shields or less-lethal tools to arrive;
crisis personnel or negotiators to respond;
communication to continue;
emotional arousal to decrease;
civilians to be evacuated;
lighting or visibility to improve;
and the person’s intentions to become clearer.

For this reason, police policy and expert witnesses sometimes describe time, distance, and cover as de-escalation resources, though these are operational concepts, not automatic constitutional commands.

When Waiting May Not Be Available

Time is not always a usable resource, and waiting can become unreasonable or dangerous where the subject is:

actively attacking someone;
rapidly advancing;
pursuing a civilian;
entering an occupied residence;
reaching a hostage;
attempting to access a firearm;
moving toward an unsecured escape path;
or otherwise converting a static encounter into an immediate threat.

The question “Why didn’t they wait?” therefore cannot be answered without asking what was expected to happen during the proposed waiting period.

Cover

Cover is a position or object capable of reducing exposure to a threat. It should be distinguished from concealment, which primarily obscures visibility without necessarily stopping a weapon. Examples of possible cover include:

engine block;
structural wall;
substantial concrete barrier;
ballistic shield;
certain building corners;
other sufficiently protective objects.

Whether an object is actually effective cover depends on the weapon and circumstances: a vehicle door may provide useful separation from a knife without providing meaningful ballistic protection from a rifle.

Cover Is Threat-Specific

In edged-weapon cases, cover can operate differently than in firearm cases. A solid barrier may prevent direct access, force the subject to navigate around an obstacle, slow movement, create time, and extend reaction distance, meaning that an object need not be bullet-resistant to be tactically useful against a contact weapon. For edged-weapon analysis, useful distinctions include:

ballistic cover;
physical barrier;
concealment;
elevation;
locked door;
vehicle;
fence;
counter;
shield;
distance without barrier.

Does the Constitution Require Officers to Use Available Cover?

The Constitution generally does not impose such a requirement as a categorical rule. A plaintiff may argue that the officer could have stayed behind cover instead of moving closer, and that fact can be relevant, but courts have generally resisted turning a tactical alternative into an absolute constitutional prerequisite. The Fourth Amendment does not ordinarily require officers to choose the safest possible tactic, the least intrusive available tactic, or the tactically preferred option before otherwise reasonable force becomes constitutional; the question remains objective reasonableness under the totality.

Tactical Alternatives Can Still Matter

The fact that a safer alternative was available can matter in at least four ways that should not be collapsed into one another:

Totality of circumstances – in some jurisdictions, the officer’s positioning may inform how the threat developed.
Officer-created jeopardy – some circuits examine whether officers recklessly or deliberately created the need for force.
Expert testimony – experts may testify that accepted police practices favored distance, cover, containment, or redeployment.
Agency policy – departmental rules may encourage or require de-escalation tactics beyond the constitutional minimum.

Tactical Error vs Constitutional Violation

An officer can make a poor tactical decision without violating the Constitution. Examples might include:

standing in the open instead of using available cover;
approaching too closely;
failing to coordinate roles;
leaving a superior position;
failing to request backup;
choosing a firearm when a shield was available.

Those facts may support criticism, but negligence, imperfect tactics, or violation of best practice does not automatically establish excessive force, and the constitutional threshold remains higher.

Officer-Created Jeopardy

This Backgrounder overlaps with the Officer-Created Jeopardy and Pre-Force Conduct Backgrounder, but the concepts should remain distinct. Officer-created jeopardy asks whether police conduct before the final threat materially contributed to creating the need to use force. Examples can include:

rushing a suicidal armed person;
closing distance unnecessarily;
leaving cover;
entering a confined space;
surrounding a person at close range;
forcing immediate physical confrontation.

Different circuits have assigned different constitutional significance to this conduct. After Barnes v. Felix, courts may not artificially isolate only the final moment of force, but Barnes did not create a nationwide rule requiring retreat, cover, containment, waiting, or de-escalation.

Estate of Ceballos v. Husk

(Estate Of Ceballos v. Husk, 2019), illustrates the tension. Ceballos was experiencing an apparent mental-health crisis and carried a baseball bat, and officers approached rather than maintaining greater separation. The Tenth Circuit considered commands, weapon movement, distance, intent, and whether the officer recklessly or deliberately contributed to creating the danger, recognizing both that Ceballos was closing distance and that officers were not required to wait until he was literally within striking range. The case also treated pre-force tactical conduct as relevant to the broader reasonableness inquiry – illustrating why “they could have backed away” is neither legally irrelevant nor automatically dispositive.

Retreat vs Tactical Redeployment

The term retreat can be misleading. Police tactics often use concepts such as:

repositioning;
redeployment;
disengagement;
containment;
tactical withdrawal;
movement to cover;
creating distance.

These are not necessarily equivalent to abandoning the encounter. An officer may move backward while:

maintaining visual contact;
preserving containment;
protecting a civilian;
covering another officer;
continuing commands;
waiting for resources.

Tactical redeployment can therefore preserve police control while increasing time and distance.

Retreat May Create New Risk

Backing away is not always safer. Retreat can:

expose civilians;
abandon another officer;
open an escape route;
permit access to a weapon;
allow entry into an occupied structure;
reduce visibility;
create crossfire issues;
or place officers in worse terrain.

This is why courts have generally avoided categorical rules.

The Tueller Drill

The Tueller Drill originated as a law-enforcement training exercise designed to illustrate how quickly a person armed with an edged weapon can close distance. It is commonly associated with approximately 21 feet and roughly 1.5 seconds under particular training conditions. The drill has often been converted in popular discussion into a supposed “21-foot rule,” which is a misleading characterization.

There Is No Constitutional “21-Foot Rule”

No federal constitutional rule holds that deadly force is justified inside 21 feet or unjustified outside 21 feet. Courts may consider officer training about reaction distance, the speed with which a person can close distance, weapon type, whether the officer’s firearm is holstered or already drawn, barriers, movement, and third-party proximity, but the number itself is not dispositive.

Estate of Larsen and the 21-Foot Concept

In (Estate Of Larsen ex rel. Sturdivan v. Murr, 2008), the court noted officer training that knife-wielding individuals within approximately 21 feet could present an imminent threat because of the time required to close distance. Importantly, the Tenth Circuit did not convert that training concept into a bright-line constitutional rule; instead, it considered multiple factors – commands and compliance, hostile motions with the weapon, distance, and manifest intentions – which represents the more defensible analytical model.

Watkins and the Problem With Treating 21 Feet as a Legal Boundary

Federal courts have sometimes encountered explicit testimony that officers were trained to view 21 feet as a danger zone. That evidence can explain officer perception, training, and why distance mattered, but it does not automatically establish constitutional reasonableness. The correct inquiry remains what the subject could do from the existing position, how quickly, toward whom, and what options the officer realistically had.

Time-and-Distance Doctrine

“Time and distance” is best understood as a tactical principle, not a standalone legal doctrine. The concept is that greater distance can create greater time for perception, decision-making, communication, repositioning, and force selection, but the relationship is not linear. Distance can be defeated by:

running;
confined spaces;
obstacles;
poor footing;
blind corners;
multiple subjects;
third-party proximity.

Likewise, short distance may be manageable where a strong physical barrier exists. Distance without geometry is therefore incomplete.

Distance to Whom?

This point is particularly important after Ventura v. Rutledge. Relevant distance can mean:

subject to officer;
subject to civilian;
subject to prior victim;
subject to dropped weapon;
officer to cover;
subject to doorway;
subject to vehicle;
subject to escape route.

A person may be thirty feet from the officer but only ten feet from a civilian, in which situation officer distance alone understates the threat.

Closing Distance

Closing distance can be tactically necessary, as when officers must accomplish a rescue, effect an arrest, prevent escape, prevent access to a civilian, secure a weapon, gain visual information, or provide medical aid. But unnecessary closing can also:

reduce reaction time;
eliminate cover;
increase weapon access;
force rapid decisions;
and turn a static crisis into a close-range confrontation.

This creates the recurring officer-created-jeopardy question of whether officers reasonably needed to close distance when they did.

Closing Distance Is Not Automatically Unconstitutional

Even where experts criticize the tactic, closing distance does not itself establish a Fourth Amendment violation. Courts have generally required something more than the observation that the officer could have stayed farther away. Depending on the circuit, the plaintiff may need to show that the officer’s pre-force conduct was reckless or deliberate, immediately connected to the need for force, and constitutionally significant under controlling precedent.

Nor Is Closing Distance Legally Irrelevant Everywhere

The opposite proposition is also too broad. Some circuits have expressly considered whether officer conduct contributed to the eventual danger, meaning that a fact such as an officer leaving cover and moving from 30 feet to 10 feet from a stationary knife-holder may be relevant even if it is not independently unconstitutional.

Poor Tactics and Expert Witnesses

Police-practices experts commonly testify about:

accepted training;
cover;
time;
distance;
containment;
de-escalation;
contact/cover roles;
tactical retreat;
waiting for backup;
less-lethal options.

Courts may admit such evidence where it helps the jury understand police practices, but experts cannot simply tell the jury that the officer violated the Fourth Amendment, because that is a legal conclusion reserved for the court or jury under proper instructions. The expert’s stronger role is to explain what tactical options existed and how police training ordinarily treats them.

Expert Evidence Can Be Relevant Without Setting the Constitutional Standard

A useful example comes from federal litigation where experts acknowledged that officers had no legal duty to retreat but still opined that leaving cover, allowing a knife-armed person to close distance, or failing to create separation departed from accepted police practice. Courts have recognized that these opinions can remain relevant to the totality even where retreat was not legally mandatory. The distinction matters: the constitutional floor is not the same as professional best practice.

Jury Instructions

Federal juries deciding § 1983 excessive-force claims are generally instructed to assess objective reasonableness, the totality of circumstances, immediate threat, resistance, severity of the offense, and other case-specific factors. They are not ordinarily instructed with a universal rule that an officer must retreat before using force or that an officer may never retreat. Likewise, juries should not receive the Tueller Drill as though it were a legal presumption; where tactical evidence is admitted, it normally informs the jury’s factual evaluation rather than replacing the constitutional standard.

Why “Why Didn’t They Just Wait?” Has No One Answer

A useful framework asks the following questions in sequence:

1. Was the subject contained?

yes;
partly;
no.

2. Who was exposed?

officer;
civilian;
subject only;
multiple people.

3. Was anyone actively being attacked?

yes;
no.

4. Was a weapon accessible?

in hand;
within reach;
separated.

5. Could the subject leave containment?

yes;
no;
uncertain.

6. What resources were approaching?

backup;
supervisor;
negotiator;
CIT;
shield;
CEW;
less-lethal launcher;
tactical team.

7. What would waiting change?

improve options;
preserve status quo;
increase danger;
allow escape;
allow access to victim/weapon.

Only then does the question become meaningful.

Contained Suicidal Knife Holder

The “why not wait?” issue is strongest where the subject is:

suicidal;
holding a knife;
stationary;
threatening only themselves;
separated from civilians;
contained;
and not moving toward officers.

In that scenario, time, distance, cover, negotiation, shields, and specialist resources may be practically available. The Fourth Amendment does not automatically require every one of those tactics, but the absence of urgency can weaken claims that immediate close contact was unavoidable. This is also where ADA accommodation, officer-created jeopardy, and emergency-aid doctrine may overlap.

Active Knife Attack

The analysis changes dramatically where the subject is:

stabbing;
chasing;
charging;
entering striking distance;
or rapidly moving toward another person.

In that situation, “wait” may simply mean allowing the attack to progress, and federal law does not generally require officers to wait until the final moment of contact before acting.

Cover and Commands

Cover can allow additional time for commands, warning, assessment, and observation of compliance. An officer behind a secure barrier may have more opportunity to issue a drop command and allow a meaningful interval for response, whereas an officer caught in open space with a rapidly advancing person may not. The commands and opportunity-to-comply analysis is therefore partly a function of tactical position.

Cover and CEW Use

Cover can also affect less-lethal feasibility. An officer with protection and backup may be better positioned to attempt a CEW deployment, impact weapon, chemical agent, or shield approach, but less-lethal tools have their own ranges, failure rates, deployment times, and transition requirements, and the availability of cover does not automatically make a less-lethal option constitutionally mandatory.

Redeployment After Failed Less-Lethal Force

Another important scenario arises when a less-lethal attempt fails and the subject remains armed, leaving the officer to either redeploy or immediately escalate. Whether redeployment is feasible depends on:

distance;
barriers;
third parties;
officer position;
weapon movement;
subject speed;
backup.

The Constitution does not impose a universal rule requiring another attempt, but a static contained scene differs from a rapidly closing threat.

Policy: Time, Distance, Cover, and Containment

Many contemporary use-of-force policies encourage officers, where safe and feasible, to slow the encounter, create distance, use cover, maintain containment, wait for resources, redeploy, and avoid unnecessary tactical compression. Some federal law-enforcement policy similarly provides both that officers need not retreat from a reasonable use of force and that officers should avoid intentionally and unreasonably placing themselves in positions where deadly force becomes the only remaining option – a formulation that captures the policy balance well. A violation of such a policy does not, however, automatically establish a Fourth Amendment violation.

Constitutional Minimum vs Policy Standard

A useful research distinction separates the following categories, which should not be merged:

Constitutional minimum

What federal law requires.

Department policy

What the agency requires.

Training

What officers are taught.

Expert best practice

What professional witnesses say should have been done.

Tactical hindsight

What appears preferable after the event.

Research-Library Coding Implications

The Lab should consider coding tactical position explicitly.

1. Initial officer distance

exact/estimated
indeterminate

2. Distance at force onset

subject→officer
subject→civilian

3. Distance trend

increasing
stable
decreasing
rapidly decreasing

4. Who closed distance?

subject
officer
both
neither
unclear

5. Cover available

yes
no
disputed
unknown

6. Cover used

yes
no
partially

7. Barrier present

door
wall
vehicle
fence
counter
shield
other
none

8. Subject contained

yes
partially
no
disputed

9. Third parties exposed

yes
no
unknown

10. Active assault

yes
no
recently ended
uncertain

11. Subject threat direction

self
officer
civilian
mixed

12. Officer advanced before force

yes
no
unknown

13. Officer retreated / redeployed

yes
no
not feasible
unknown

14. Backup en route

yes
no
unknown

15. Specialist resources available / en route

CIT
negotiator
shield
tactical team
less-lethal
other

16. Time available before force

immediate
seconds
minutes
prolonged containment

17. Expert criticized tactical positioning

18. Court treated tactics as constitutionally relevant

yes
no
limited
unclear

19. Policy violation alleged

cover
de-escalation
containment
distance
supervisor
other

This permits analysis of the sequence: distance → cover → containment → movement → available time → threat transition → force.

Leading Decisions – Chronological

Graham v. Connor

Rule: Force is assessed under objective reasonableness and the totality of circumstances.

Importance: Tactical positioning is relevant only insofar as the governing jurisdiction treats it as part of that totality; Graham does not impose a retreat requirement.

Allen v. Muskogee

Rule: In the Tenth Circuit, reckless or deliberate police conduct immediately connected to the use of force may be relevant where officers rapidly approach and escalate an armed suicidal encounter.

Importance: Foundational officer-created-jeopardy / tactical-compression authority.

Estate of Larsen v. Murr

Rule: Distance matters together with commands, hostile weapon movement, and manifest intent; there is no requirement that an officer wait until a knife-holder reaches literal striking distance.

Importance: Also notes the 21-foot training concept without converting it into a constitutional rule.

Lal v. California

Rule: Officers were not required to rely on distance, barriers, or de-escalation once the subject forced the issue by advancing and creating an immediate threat.

Importance: Illustrates the limits of “why didn’t they wait?” where waiting no longer safely preserves the status quo.

Stewart v. City of Euclid

Rule: No duty to retreat does not automatically justify deadly force; tactical positioning and available exit can still inform the totality.

Importance: One of the clearest appellate statements separating absence of retreat duty from overall force reasonableness.

Barnes v. Felix

Rule: Courts may not artificially restrict excessive-force review to a narrow final moment.

Importance: Supports consideration of relevant preceding events but does not impose a nationwide constitutional duty to retreat, maintain cover, or de-escalate.

What the Rule Does Not Establish

This body of law does not establish that:

officers have a categorical constitutional duty to retreat;
officers must always seek cover before using force;
officers must always wait for backup;
containment is always constitutionally required;
closing distance automatically violates the Fourth Amendment;
leaving cover automatically constitutes officer-created jeopardy;
poor tactics automatically equal excessive force;
department policy defines the constitutional standard;
expert testimony defines constitutional law;
the Tueller Drill is a legal rule;
21 feet is a constitutional threshold;
officers must wait until an edged weapon reaches touching distance;
or officers may always advance simply because they have no duty to retreat.

Policy Implications

A defensible policy approach recognizes both that officers need not surrender safety or wait for an imminent attack to mature into injury, and that when circumstances safely permit, time, distance, cover, containment, and tactical redeployment can reduce unnecessary exposure and expand response options. Good policy can therefore encourage:

use of available cover;
deliberate distance management;
containment of non-mobile threats;
avoidance of unnecessary approach;
reassessment before closing distance;
waiting for resources where delay does not increase danger;
tactical withdrawal where it improves safety without exposing others;
role coordination;
and clear articulation when immediate intervention overrides these options.

Research-Library Conclusion

Federal law generally does not impose a categorical duty on police officers to retreat, seek cover, or wait before using otherwise reasonable force. But “no duty to retreat” is not a constitutional trump card, and there is likewise no duty to rush forward. Distance, available cover, barriers, containment, and tactical redeployment may be relevant to the totality of circumstances, to officer-created-jeopardy analysis in some circuits, and to expert or policy evidence even when they are not constitutionally mandated. The Tueller Drill is best understood as a training demonstration of time-and-distance constraints, not a “21-foot rule” authorizing deadly force. For edged-weapon incidents, the key question is not simply how many feet separated the subject and officer, but who was moving, toward whom, at what speed, with what barriers, what cover, what third-party exposure, and how much usable time remained. The question “Why didn’t police just wait?” therefore requires a concrete counterfactual: what would waiting have preserved, improved, or endangered?

Not Legal Advice

This Backgrounder is for research and educational purposes. It summarizes federal constitutional doctrine, tactical concepts, and selected authorities. It is not legal advice and should not substitute for jurisdiction-specific legal research by qualified counsel.

References

Estate Of Ceballos v. Husk (2019). 919 F.3d 1204.

Estate Of Larsen ex rel. Sturdivan v. Murr, 511 F.3d 1255 (10th Cir. 2008) (2008). 511 F.3d 1255, United States Court of Appeals, Tenth Circuit. https://casetext.com/case/estate-of-larsen-v-murr

Stewart v. City Of Euclid (2020). 970 F.3d 667.

How to cite

Edged-Weapon Response Lab. (2026). Distance, Cover, and Tactical Positioning. In EWRL Law & Policy Analysis (Version 1.0). https://droptheknife.org/law-and-policy/distance_cover_tactical_positioning