CT Gen Stat § 53a-18 (2020)
2020 Connecticut General Statutes|Title 53a - Penal Code|Chapter 951 - Penal Code: Statutory Construction; Principles of Criminal Liability|Section 53a-18 - Use of reasonable physical force or deadly physical force generally.

 (a) The use of physical force upon another person which would otherwise constitute an offense is justifiable and not criminal under any of the following circumstances:(1) A parent, guardian or other person entrusted with the care and supervision of a minor or an incompetent person, except a person entrusted with the care and supervision of a minor for school purposes as described in subdivision (6) of this section, may use reasonable physical force upon such minor or incompetent person when and to the extent that he or she reasonably believes such to be necessary to maintain discipline or to promote the welfare of such minor or incompetent person.(2) An authorized official of a correctional institution or facility may, in order to maintain order and discipline, use such physical force as is reasonable and authorized by the rules and regulations of the Department of Correction.(3) A person responsible for the maintenance of order in a common carrier of passengers, or a person acting under his or her direction, may use reasonable physical force when and to the extent that he or she reasonably believes such to be necessary to maintain order, but he or she may use deadly physical force only when he or she reasonably believes such to be necessary to prevent death or serious physical injury.(4) A person acting under a reasonable belief that another person is about to commit suicide or to inflict serious physical injury upon himself or herself may use reasonable physical force upon such person to the extent that he or she reasonably believes such to be necessary to thwart such result.(5) A duly licensed physician or psychologist, or a person acting under his or her direction, may use reasonable physical force for the purpose of administering a recognized form of treatment which he or she reasonably believes to be adapted to promoting the physical or mental health of the patient, provided the treatment (A) is administered with the consent of the patient or, if the patient is a minor or an incompetent person, with the consent of his or her parent, guardian or other person entrusted with his or her care and supervision, or (B) is administered in an emergency when the physician or psychologist reasonably believes that no one competent to consent can be consulted and that a reasonable person, wishing to safeguard the welfare of the patient, would consent.(6) A teacher or other person entrusted with the care and supervision of a minor for school purposes may use reasonable physical force upon such minor when and to the extent such teacher or other person reasonably believes such force to be necessary to (A) protect himself or herself or others from immediate physical injury, (B) obtain possession of a dangerous instrument or controlled substance, as defined in subdivision (9) of section 21a-240, upon or within the control of such minor, (C) protect property from physical damage or (D) restrain such minor or remove such minor to another area, to maintain order.(b) No person is justified in using force upon another person which would otherwise constitute an offense based solely on the discovery of, knowledge about or potential disclosure of the victim's actual or perceived sex, sexual orientation or gender identity or expression, including under circumstances in which the victim made an unwanted, nonforcible, romantic or sexual advance toward the defendant, or if the defendant and victim dated or had a romantic relationship.(1969, P.A. 828, S. 18; 1971, P.A. 871, S. 4; P.A. 73-205, S. 6; P.A. 89-186, S. 1, 2; P.A. 90-43; P.A. 92-260, S. 3; P.A. 19-27, S. 3.)History: 1971 act specified that force used in Subdivs. (1), (3), (4) and (5) must be “reasonable” physical force; P.A. 73-205 deleted language specifically forbidding use of “deadly physical force” in Subdiv. (1); P.A. 89-186 added new Subdiv. (6) re the use of reasonable physical force by a teacher or other person entrusted with the care and supervision of a minor for school purposes and amended Subdiv. (1) accordingly; P.A. 90-43 applied provisions of Subdiv. (5) to psychologists; P.A. 92-260 amended Subdivs. (1), (3), (4) and (6) to make technical change by replacing “it is necessary” with “such to be necessary”; P.A. 19-27 designated existing provisions re circumstances under which use of physical force justifiable and not criminal as Subsec. (a) and amended same by making technical changes, and added Subsec. (b) re discovery, knowledge or potential disclosure of victim's actual or perceived sex, sexual orientation or gender identity or expression.