durham rule
Durham rule. Criminal law. A test for the insanity defense, holding that a defendant is not criminally responsible for an act that was the product of mental disease or defect (Durham v. United States, 214 F.2d 862 (D.C. Cir. 1954)). • Formerly used in New Hampshire and the District of Columbia, the Durham rule has been criticized as being too broad and is no longer accepted in any American jurisdiction. — Also termed product test. See INSANITY DEFENSE. [Cases: Criminal Law 48.]