Voluntariness, intention, and the defence of mental disorder: toward a rational approach.

This article addresses how mental disorder may be used in common law countries to negate the requirements of voluntariness and intention in serious criminal offences as well as to provide the basis for current versions of the insanity defence. The notion that mental disorder can cause conduct to become completely involuntary or unintentional is questionable, given current thinking in the behavioral sciences. This article argues that different forms of mental disorder should be subsumed within a separate defence of mental disorder. Providing that a range of dispositional options is available, the law in this complex area would be simplified and brought into line with current psychological notions of goal-directed behavior.