RT Journal Article SR Electronic T1 United States v. Lyons: Toward a New Conception of Legal Insanity JF Journal of the American Academy of Psychiatry and the Law Online JO J Am Acad Psychiatry Law FD American Academy of Psychiatry and the Law SP 49 OP 58 VO 16 IS 1 A1 Mossman, Douglas YR 1988 UL http://jaapl.org/content/16/1/49.abstract AB In United States v. Lyons (1984), the U.S. Fifth Circuit Court altered its definition of legal insanity to conform with recent recommendations of the American Bar Association and the American Psychiatric Association. This paper briefly reviews the social and legal context of the Court’s ruling. The author then discusses the insanity defense’s rationale and suggests an interpretation of the Court’s new definition that should guide psychiatric testimony.