555 CMR 6.05 - Use of Deadly Force

(1) A law enforcement officer shall not use deadly force upon a person, unless de-escalation tactics have been attempted and failed or are not feasible based on the totality of the circumstances and such force is necessary to prevent imminent harm to a person and the amount of force used is proportionate to the threat of imminent harm, and;
(a) The imminent harm poses an imminent danger of death or serious bodily injury to the officer or another person;
(b) The officer attempts as many de-escalation tactics that are feasible under the circumstances, including utilizing barriers where feasible; and
(c) The officer uses only the amount of force that is objectively reasonable.
(2) A law enforcement officer shall not use a chokehold or other tactics that restrict or obstruct an individual's breathing or oxygen or blood flow to an individual's head or neck. A law enforcement officer shall not be trained to use a lateral vascular neck restraint, carotid restraint or other action that involves the placement of any part of law enforcement officer's body on or around a person's neck in a manner that limits the person's breathing or blood flow.
(3) An officer may not use deadly force against a person who poses only a danger to themselves.
(4) A law enforcement officer shall not discharge any firearm into or at a moving motor vehicle unless, based on the totality of the circumstances, including the risk of safety to other persons in the area, such discharge is objectively reasonable, necessary to prevent imminent harm to a person and the discharge is proportionate to the threat of imminent harm; and only if the following conditions exist:
(a) A person in the vehicle is threatening the officer or another person with deadly force by means other than the vehicle; or the vehicle is operated in a manner deliberately intended to strike an officer or another person, and all other reasonable means of defense have been exhausted or are not present or practical, which includes moving out of the path of the vehicle;
(b) Officers have not intentionally positioned themselves in such a way as to create a likelihood of being struck by an occupied vehicle (e.g., surrounding a vehicle at close proximity while dismounted);
(c) The officer is not firing strictly to disable the vehicle; and
(d) The circumstances provide a high probability of stopping or striking the intended target.
(5) A law enforcement officer shall not use deadly force at any point in time when there is no longer an objectively reasonable belief that an individual currently and actively poses an immediate threat of serious bodily harm or death, even if deadly force would have been justified at an earlier point in time.
(6) Where feasible based on the totality of the circumstances, officers shall verbally identify themselves as police officers and issue some warning before using deadly force.
(7) Officers shall always provide appropriate medical response to an individual following a use of deadly force when safe and tactically feasible.

Notes

555 CMR 6.05
Adopted by Mass Register Issue 1453, eff. 10/1/2021. Amended by Mass Register Issue 1474, eff. 10/1/2021. Amended by Mass Register Issue 1476, eff. 8/5/2022 (EMERGENCY). Amended by Mass Register Issue 1483, eff. 8/5/2022 (COMPLIANCE).

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