Title 18Crimes and Criminal ProcedureRelease 119-73not60

§4242 Determination of the Existence of Insanity at the Time of the Offense

Title 18 › Part III— PRISONS AND PRISONERS › Chapter 313— OFFENDERS WITH MENTAL DISEASE OR DEFECT › § 4242

Last updated Apr 5, 2026|Official source

Summary

If a defendant files a notice under Rule 12.2 saying they will use an insanity defense, the court must order a psychiatric or psychological exam and have a report filed with the court if the government's lawyer asks, under section 4247(b) and (c). If the insanity issue is raised under Rule 12.2 by the defendant, the government's lawyer, or the court itself, the jury must be told to decide — or if there is no jury, the judge must decide — whether the defendant is guilty, not guilty, or not guilty only because of insanity.

Full Legal Text

Title 18, §4242

Crimes and Criminal Procedure — Source: USLM XML via OLRC

(a)Upon the filing of a notice, as provided in Rule 12.2 of the Federal Rules of Criminal Procedure, that the defendant intends to rely on the defense of insanity, the court, upon motion of the attorney for the Government, shall order that a psychiatric or psychological examination of the defendant be conducted, and that a psychiatric or psychological report be filed with the court, pursuant to the provisions of section 4247(b) and (c).
(b)If the issue of insanity is raised by notice as provided in Rule 12.2 of the Federal Rules of Criminal Procedure on motion of the defendant or of the attorney for the Government, or on the court’s own motion, the jury shall be instructed to find, or, in the event of a nonjury trial, the court shall find the defendant—
(1)guilty;
(2)not guilty; or
(3)not guilty only by reason of insanity.

Legislative History

Notes & Related Subsidiaries

Historical and Revision Notes

Based on title 18, U.S.C., 1940 ed., § 877 (May 13, 1930, ch. 254, § 7, 46 Stat. 272). Minor change was made in phraseology.

Editorial Notes

Amendments

1984—Pub. L. 98–473 amended section generally, substituting “Determination of the existence of insanity at the time of the offense” for “Retransfer upon recovery” in section catchline, and substituting provisions relating to motion for pretrial psychiatric or psychological examination, and special verdict, for provisions relating to retransfer to a penal or correctional institution upon recovery of an inmate of the United States hospital for defective delinquents.

Reference

Citations & Metadata

Citation

18 U.S.C. § 4242

Title 18Crimes and Criminal Procedure

Last Updated

Apr 5, 2026

Release point: 119-73not60