Oregon Revised Statutes Labor and Employment; Unlawful Discrimination § 654.423

(a) Was acting in self-defense in response to the use or imminent use of physical force;

(b) Used an amount of physical force that was reasonably necessary to protect the employee or a third person from assault; and

(c) Used the least restrictive procedures necessary under the circumstances, in accordance with an approved behavior management plan, or other methods of response approved by the health care employer.