Recent Case Law Affecting Oklahoma Federal Defense

The federal criminal defense landscape in Oklahoma changed fundamentally on July 9, 2020, when the Supreme Court decided McGirt v. Oklahoma. The rulings that followed reshaped who may prosecute crimes in eastern Oklahoma, and the Tenth Circuit continues to refine the boundaries in cases arising from the state's three federal districts.

McGirt v. Oklahoma, 591 U.S. 894 (2020)

In McGirt v. Oklahoma, the Supreme Court held that the Creek (Muscogee) Reservation in eastern Oklahoma was never disestablished by Congress and remains Indian country for purposes of federal criminal law. Justice Gorsuch wrote for a 5–4 Court. The consequence: major crimes committed by Indians in that territory fall under the Major Crimes Act, 18 U.S.C. § 1153, within the exclusive jurisdiction of the United States. The State of Oklahoma therefore lacked jurisdiction to prosecute Jimcy McGirt, an enrolled member of the Seminole Nation, for offenses committed on the Creek Reservation.

Oklahoma v. Castro-Huerta, 597 U.S. 629 (2022)

Two years later, in Oklahoma v. Castro-Huerta, the Court drew the other boundary: the State and the Federal Government have concurrent jurisdiction to prosecute crimes committed by non-Indians against Indians in Indian country. Justice Kavanaugh wrote for the 5–4 Court; Justice Gorsuch dissented. State prosecution of non-Indian defendants in eastern Oklahoma remains available, while federal jurisdiction under the General Crimes Act, 18 U.S.C. § 1152, and the Assimilative Crimes Act, 18 U.S.C. § 13, continues to operate.

United States v. Smith, Nos. 24-5088 & 24-5096 (10th Cir. 2026)

The Tenth Circuit applied that framework in United States v. Smith, a published opinion decided June 9, 2026 by Judges Rossman, Matheson, and Carson. Two defendants — one an enrolled Cherokee Nation member and one non-Indian — were convicted in the Northern District of Oklahoma of child abuse and child neglect under Oklahoma law for offenses committed in Indian country. The court rejected the non-Indian defendant's argument that Castro-Huerta eliminated federal jurisdiction to prosecute her under the Assimilative Crimes Act and the General Crimes Act. On sentencing, the court held that the district court committed procedural error: because no guideline has been promulgated for the assimilated Oklahoma offense, the court was required under USSG § 2X5.1 to apply the most analogous offense guideline — here USSG § 2A2.2 (aggravated assault) — and the government failed to show the error was harmless. The case was remanded for resentencing.

Brown v. United States (2024)

On the sentencing-enhancement side, the Supreme Court in Brown v. United States, 602 U.S. ___ (2024), held that a prior state drug conviction qualifies as an Armed Career Criminal Act “serious drug offense” when the drug was on the federal schedules at the time of the prior state offense — a later change in the federal drug schedules does not erase the predicate. Justice Alito wrote for the 6–3 Court, applying the backward-looking approach of McNeill v. United States.

For Oklahoma federal practice, the through-line is jurisdiction first: whether the alleged offense occurred in Indian country, whether the defendant is Indian, and which sovereign — federal, state, or tribal — may prosecute. The Tenth Circuit's docket continues to produce decisions applying McGirt and Castro-Huerta to prosecutions arising in the Northern, Eastern, and Western Districts of Oklahoma, and this page is updated as new opinions are published.