(a)A peace officer, or any person whom he has summoned or directed to assist him, need not retreat or desist from efforts to make a lawful arrest because of resistance or threatened resistance to the arrest. He is justified in the use of any force which he reasonably believes, based on the totality of the circumstances, to be necessary to effect the arrest and of any force which he reasonably believes, based on the totality of the circumstances, to be necessary to defend himself or another from bodily harm while making the arrest. However, he is justified in using force likely to cause death or great bodily harm only when:
(i)he reasonably believes, based on the totality of the circumstances, that such force is necessary to prevent death or great bodily harm to himself or such other pers
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(a) A peace officer, or any person whom he has summoned or directed to assist him, need not retreat or desist from efforts to make a lawful arrest because of resistance or threatened resistance to the arrest. He is justified in the use of any force which he reasonably believes, based on the totality of the circumstances, to be necessary to effect the arrest and of any force which he reasonably believes, based on the totality of the circumstances, to be necessary to defend himself or another from bodily harm while making the arrest. However, he is justified in using force likely to cause death or great bodily harm only when: (i) he reasonably believes, based on the totality of the circumstances, that such force is necessary to prevent death or great bodily harm to himself or such other person; or (ii) when he reasonably believes, based on the totality of the circumstances, both that: (1) Such force is necessary to prevent the arrest from being defeated by resistance or escape and the officer reasonably believes that the person to be arrested is likely to cause great bodily harm to another; and (2) The person to be arrested committed or attempted a forcible felony which involves the infliction or threatened infliction of great bodily harm or is attempting to escape by use of a deadly weapon, or otherwise indicates that he will endanger human life or inflict great bodily harm unless arrested without delay. As used in this subsection, "retreat" does not mean tactical repositioning or other de-escalation tactics. A peace officer is not justified in using force likely to cause death or great bodily harm when there is no longer an imminent threat of great bodily harm to the officer or another. (a-5) Where feasible, a peace officer shall, prior to the use of force, make reasonable efforts to identify himself or herself as a peace officer and to warn that deadly force may be used. (a-10) A peace officer shall not use deadly force against a person based on the danger that the person poses to himself or herself if a reasonable officer would believe the person does not pose an imminent threat of death or great bodily harm to the peace officer or to another person. (a-15) A peace officer shall not use deadly force against a person who is suspected of committing a property offense, unless that offense is terrorism or unless deadly force is otherwise authorized by law. (b) A peace officer making an arrest pursuant to an invalid warrant is justified in the use of any force which he would be justified in using if the warrant were valid, unless he knows that the warrant is invalid. (c) The authority to use physical force conferred on peace officers by this Article is a serious responsibility that shall be exercised judiciously and with respect for human rights and dignity and for the sanctity of every human life. (d) Peace officers shall use deadly force only when reasonably necessary in defense of human life. In determining whether deadly force is reasonably necessary, officers shall evaluate each situation in light of the totality of circumstances of each case, including, but not limited to, the proximity in time of the use of force to the commission of a forcible felony, and the reasonable feasibility of safely apprehending a subject at a later time, and shall use other available resources and techniques, if reasonably safe and feasible to a reasonable officer. (e) The decision by a peace officer to use force shall be evaluated carefully and thoroughly, in a manner that reflects the gravity of that authority and the serious consequences of the use of force by peace officers, in order to ensure that officers use force consistent with law and agency policies. (f) The decision by a peace officer to use force shall be evaluated from the perspective of a reasonable officer in the same situation, based on the totality of the circumstances known to or perceived by the officer at the time of the decision, rather than with the benefit of hindsight, and that the totality of the circumstances shall account for occasions when officers may be forced to make quick judgments about using force. (g) Law enforcement agencies are encouraged to adopt and develop policies designed to protect individuals with physical, mental health, developmental, or intellectual disabilities, or individuals who are significantly more likely to experience greater levels of physical force during police interactions, as these disabilities may affect the ability of a person to understand or comply with commands from peace officers. (h) As used in this Section: (1) "Deadly force" means any use of force that creates a substantial risk of causing death or great bodily harm, including, but not limited to, the discharge of a firearm. (2) A threat of death or serious bodily injury is "imminent" when, based on the totality of the circumstances, a reasonable officer in the same situation would believe that a person has the present ability, opportunity, and apparent intent to immediately cause death or great bodily harm to the peace officer or another person. An imminent harm is not merely a fear of future harm, no matter how great the fear and no matter how great the likelihood of the harm, but is one that, from appearances, must be instantly confronted and addressed. (3) "Totality of the circumstances" means all facts known to the peace officer at the time, or that would be known to a reasonable officer in the same situation, including the conduct of the officer and the subject leading up to the use of deadly force.