18 U.S.C. § 13
Section 13 · Laws of States adopted for areas within Federal jurisdiction
This is the Assimilative Crimes Act
Amended 2 times on record
Applied in 1,000 court decisions — leading case Parker v. Levy (1974)
Most recently applied in State v. Thurmond (November 2025)
Applied most in the Fourth Circuit Circuit (166 decisions)
Cases citing this section usually also cite 18 U.S.C. § 113 · 18 U.S.C. § 7 · 18 U.S.C. § 1153
How often courts cite this section
Court decisions citing this, by year.Markers show enactment, consequential amendments, and circuit splits over this section — watch for a citation surge after a change or a disagreement. The dip in the last several years is a data-coverage gap, not a real trend — our corpus holds fewer opinions from the most recent years, so recent citations are undercounted.
(a) Consistent with applicable authorities and duties, including those conferred by the Constitution upon the executive and legislative branches, the Attorney General shall report orally or in writing semiannually to the Permanent Select Committee on Intelligence of the United States House of Representatives, the Select Committee on Intelligence of the United States Senate, and the chairmen and ranking minority members of the Committees on the Judiciary of the Senate and House of Representatives on all cases where a decision not to prosecute a violation of Federal law pursuant to section 12(a) has been made.
(b) In the case of the semiannual reports (whether oral or written) required to be submitted under subsection (a) to the Permanent Select Committee on Intelligence of the House of Representatives and the Select Committee on Intelligence of the Senate, the submittal dates for such reports shall be as provided in section 507 of the National Security Act of 1947.
(c) The Attorney General shall deliver to the appropriate committees of Congress a report concerning the operation and effectiveness of this Act and including suggested amendments to this Act. For the first three years this Act is in effect, there shall be a report each year. After three years, such reports shall be delivered as necessary.
Editorial notes U.S. Code · Office of the Law Revision Counsel
References in Text
Section 507 of the National Security Act of 1947, referred to in subsec. (b), is classified to section 3106 of Title 50, War and National Defense.
Amendments
2002—Subsecs. (b), (c). Pub. L. 107–306 added subsec. (b) and redesignated former subsec. (b) as (c).