(a) The use of force on another person that would otherwise constitute an offense is justified under any of the following circumstances:

(1) When and to the extent reasonably necessary and appropriate to promote the welfare of the child or incompetent person, a parent, guardian, or other person entrusted with the care and supervision of a child under 18 years of age or an incompetent person may use reasonable and appropriate nondeadly force on that child or incompetent person.

(2) When and to the extent reasonably necessary and appropriate to maintain order and when the use of force is consistent with the welfare of the students, a teacher may, if authorized by school regulations and the principal of the school, use reasonable and appropriate nondeadly force on a student. If authorized by school regulations and the principal of the school, a teacher may use nondeadly force under this paragraph in any situation in which the teacher is responsible for the supervision of students. A teacher employed by a school board, including a regional educational attendance area school board, may use nondeadly force under this paragraph only if the school regulations authorizing the use of force have been adopted by the school board.

(3) When and to the extent reasonably necessary and appropriate to maintain order, a person responsible for the maintenance of order in a common carrier of passengers, or a person acting under that person's direction, may use reasonable and appropriate nondeadly force.

(4) When and to the extent reasonably necessary to prevent a suicide, a person who reasonably believes that another is imminently about to commit suicide may use reasonable and appropriate nondeadly force on that person.

(5) A licensed physician, licensed mobile intensive care paramedic, or registered or advanced practice registered nurse; or a person acting under the direction of a licensed physician, licensed mobile intensive care paramedic, or registered or advanced practice registered nurse; or any person who renders emergency care at the scene of an emergency, may use reasonable and appropriate nondeadly force for the purpose of administering a recognized and lawful form of treatment that is reasonably adapted to promoting the physical or mental health of the patient if

(A) the treatment is administered with the consent of the patient or, if the patient is a child under 18 years of age or an incompetent person, with the consent of the parent, guardian, or other person entrusted with care and supervision of the child or incompetent person; or

(B) the treatment is administered in an emergency if the person administering the treatment reasonably believes that no one competent to consent can be consulted under the circumstances and that a reasonable person, wishing to safeguard the welfare of the patient, would consent.

(b) A person who raises a defense under (a)(1) of this section and claims that the person upon whom force was used was an incompetent person has the burden of establishing by a preponderance of the evidence that, at the time force was used, the person upon whom the force was used was an incompetent person.