Insanity Defense Reform Act of 1984 (IDRA)
Definition
The statute, codified at 18 U.S.C. § 17, that reformed the case-law definition of the federal insanity defense by narrowing the availability of the defense and shifting to the defendant the burden of proving, by clear and convincing evidence, that at the time of his offense he was prevented by a mental disease or defect from appreciating the nature or quality or wrongfulness of his conduct.