2015 ORS § 161.360¹
Mental disease or defect excluding fitness to proceed
(1) If, before or during the trial in any criminal case, the court has reason to doubt the defendants fitness to proceed by reason of incapacity, the court may order an examination in the manner provided in ORS 161.365 (Procedure for determining issue of fitness to proceed).
(2) A defendant may be found incapacitated if, as a result of mental disease or defect, the defendant is unable:
(a) To understand the nature of the proceedings against the defendant; or
(b) To assist and cooperate with the counsel of the defendant; or
(c) To participate in the defense of the defendant. [1971 c.743 §50; 1993 c.238 §1]