insanity defense

(redirected from Mental disease or defect)
Also found in: Medical, Legal.
Related to Mental disease or defect: Plea of temporary insanity

insanity de·fense

n. defensa por demencia.
References in periodicals archive ?
Moussaoui's decision to waive his right to counsel may be the product of a mental disease or defect rendering the decision involuntary.
The ALI Rule states, "A person is not responsible for criminal conduct if at the time of such conduct as a result of mental disease or defect he lacks substantial capacity either to appreciate the criminality of his conduct or to conform his conduct to the requirements of the law?
Bazelon's assertion-"Our traditions also require that, where such [criminal] acts stem from and are the product of mental disease or defect as these terms are used herein, moral blame shall not attach and hence there will not be criminal responsibility"-was a completely logical extension of Freudian thinking about criminal behavior.