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RSMo 563.031effective 14 Oct 2016

Use of force in defense of persons

In plain English

Missouri law says a person can use physical force to protect themselves or someone else if they honestly and reasonably think it is needed to stop an unlawful attack. A person cannot use deadly force unless they reasonably believe it is needed to prevent death, serious injury, a forcible felony, or to stop someone from breaking into a home, vehicle, or private property. A person does not have to try to run away or retreat before using force if they are in a place they have the right to be.

Word-for-word law

*563.031. Use of force in of persons. — 1. A person may, subject to the of 2 of this section, use physical force upon another person when and to the extent he or she reasonably believes such force to be necessary to defend himself or herself or a third person from what he or she reasonably believes to be the use or use of force by such other person, unless:

(1) The was the ; except that in such case his or her use of force is nevertheless provided:

(a) He or she has withdrawn from the encounter and effectively communicated such withdrawal to such other person but the latter persists in continuing the incident by the use or threatened use of unlawful force; or

(b) He or she is a and as such is an aggressor section 563.046; or

(c) The aggressor is under some other of this chapter or other provision of law;

(2) Under the circumstances as the actor reasonably believes them to be, the person whom he or she seeks to protect would not be justified in using such ;

(3) The actor was attempting to commit, committing, or escaping after the of a .

2. A person shall not use upon another person under the circumstances specified in subsection 1 of this section unless:

(1) He or she reasonably believes that such deadly force is necessary to protect himself, or herself or her unborn child, or another against death, , or any forcible felony;

(2) Such force is used against a person who enters, remains after unlawfully entering, or attempts to unlawfully enter a , residence, or vehicle lawfully occupied by such person; or

(3) Such force is used against a person who unlawfully enters, remains after unlawfully entering, or attempts to unlawfully enter private property that is owned or leased by an individual, or is occupied by an individual who has been given specific by the property owner to occupy the property, claiming a of using protective force under this section.

3. A person does not have a duty to retreat:

(1) From a dwelling, residence, or vehicle where the person is not unlawfully entering or unlawfully remaining;

(2) From private property that is owned or leased by such individual; or

(3) If the person is in any other location such person has the right to be.

4. The justification afforded by this section extends to the use of as protective force provided that the actor takes all reasonable measures to terminate the as soon as it is reasonable to do so.

5. The shall have the of justification under this section. If a defendant asserts that his or her use of force is described under (2) of subsection 2 of this section, the shall then be on the state to prove that the defendant did not reasonably believe that the use of such force was necessary to defend against what he or she reasonably believed was the use or imminent use of unlawful force.

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Source & history notes

(L. 1977 S.B. 60, A.L. 1993 S.B. 180, A.L. 2007 S.B. 62 & 41, A.L. 2010 H.B. 1692, et al. merged with H.B. 2081, A.L. 2016 S.B. 656) *Effective 10-14-16, see § 21.250. S.B. 656 was vetoed June 27, 2016. The veto was overridden on September 14, 2016.

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Legal information, not legal advice. Always confirm with the official source at revisor.mo.gov.

RSMo 563.031: Use of force in defense of persons | KnowMo Laws