Supreme Court Cases

Cases

These are cases where this concept was identified as relevant. Click a case to view its summary, holding, and supporting syllabus excerpts.

• Watson v. Republican National Committee 29th June 2026
  The case directly addresses whether federal election-day statutes preempt state law regarding the receipt of absentee ballots.
• Monsanto v. Durnell 25th June 2026
  The Court's holding is based on the principle that federal law, specifically FIFRA, preempts state law claims that impose additional labeling requirements.
• Montgomery v. Caribe Transport II, LLC 14th May 2026
  The case primarily deals with whether state negligent-hiring claims are preempted by the FAAAA.
• Martin v. United States 12th June 2025
  The Court addressed whether the Supremacy Clause provides a defense in FTCA suits, which involves preemption principles.
• Smith & Wesson Brands, Inc. v. Estados Unidos Mexicanos 5th June 2025
  The case involves the application of the Protection of Lawful Commerce in Arms Act (PLCAA), which preempts certain state and federal lawsuits against gun manufacturers.
• Williams v. Reed 21st February 2025
  The Court held that federal law under § 1983 preempts state laws that effectively immunize state officials from federal claims.
• Moyle v. United States 27th June 2024
  The case involves a conflict between federal law (EMTALA) and state law (Idaho's abortion restrictions), with the Court addressing whether federal law preempts state law.
• Snyder v. United States 26th June 2024
  The Court discusses the potential for federal law to override state regulations, which is a key aspect of preemption.
• Cantero v. Bank of America, N. A. 30th May 2024
  The case primarily concerns whether New York's law is preempted by federal law, specifically the National Bank Act as interpreted in conjunction with Dodd-Frank.
• Brown v. United States 23rd May 2024
  The case discusses the relationship between federal and state drug definitions and how federal law impacts state convictions under ACCA.
• Smith v. Spizzirri 16th May 2024
  The case involves the Federal Arbitration Act, which preempts state law by requiring federal courts to stay proceedings pending arbitration.
• Ohio Adjutant General’s Dept. v. FLRA 18th May 2023
  The decision implies federal law preempts state law regarding the employment and labor relations of dual-status technicians.
• Oklahoma v. Castro-Huerta 29th June 2022
  The Court analyzed whether federal law preempts state jurisdiction in Indian country.
• United States v. Washington 21st June 2022
  The case centers on whether Washington's law is preempted by federal law under the Supremacy Clause.
• Viking River Cruises, Inc. v. Moriana 15th June 2022
  The case primarily deals with whether the Federal Arbitration Act preempts a California rule.
• Ysleta del Sur Pueblo v. Texas 15th June 2022
  The Court examines whether federal law, specifically the Restoration Act, preempts Texas state gaming laws on tribal lands.
• Gallardo v. Marstiller 6th June 2022
  The case involves the interpretation of federal Medicaid statutes and whether they preempt state law regarding the recovery of medical expenses from settlement funds.
• Morgan v. Sundance, Inc. 23rd May 2022
  The decision addresses the federal policy under the FAA and its impact on state and federal court procedures.
• Sharp v. Murphy 9th July 2020
  The decision implies federal law preempts state jurisdiction over crimes in Indian country, reinforcing federal authority.
• McGirt v. Oklahoma 9th July 2020
  The decision involves federal law overriding state law concerning jurisdiction over crimes in Indian country under the Major Crimes Act.