Explore 25 court opinions on Supremacy Clause. AI-powered plain English summaries, key holdings, and legal analysis.
25 recent cases analyzed in this topic area.
Ninth Circuit Upholds Federal Authority Over Immigration Enforcement
United States v. State of California, decided by Ninth Circuit on April 22, 2026, resulted in a defendant win outcome. The Ninth Circuit affirmed the district court's grant of summary judgment to the ...
State 'Ban the Box' Law's Anti-Retaliation Provision Upheld Against Federal Challenge
Chiles v. Salazar, decided by Supreme Court of the United States on March 31, 2026, resulted in a defendant win outcome. The Supreme Court considered whether a state's "no-retaliation" provision in it...
Fifth Circuit Blocks Texas SB4 Immigration Law as Federal Preemption
La Union del Pueblo Entero v. Abbott, decided by Fifth Circuit on February 12, 2026, resulted in a plaintiff win outcome. The Fifth Circuit Court of Appeals considered whether Texas's SB4 immigration ...
Undocumented immigrants fail to block employer immigration status verification law
Bonilla-Espinoza v. Bondi, decided by Tenth Circuit on January 27, 2026, resulted in a defendant win outcome. The Tenth Circuit affirmed the district court's denial of a preliminary injunction sought ...
State law on firearm possession upheld against federal preemption challenge
This case involves a dispute over whether the state of Washington could prosecute an individual, Lee, for violating a state law that prohibited the possession of certain types of firearms. Lee argued ...
SCOTUS Upholds ICWA Supremacy Over State 'Best Interests' in Adoptions
Case v. Montana, decided by Supreme Court of the United States on January 14, 2026, resulted in a plaintiff win outcome. The Supreme Court reviewed a Montana Supreme Court decision that allowed a stat...
Ninth Circuit: Trump Not Immune from Defamation Suit for Personal Statements
State of Oregon v. Trump, decided by Ninth Circuit on October 28, 2025, resulted in a plaintiff win outcome. The Ninth Circuit Court of Appeals affirmed the district court's denial of former President...
Cannabis retailer fails to block state enforcement of drug laws
Green Room v. State of Wyoming, decided by Tenth Circuit on October 27, 2025, resulted in a defendant win outcome. The Tenth Circuit affirmed the district court's denial of a preliminary injunction so...
Ninth Circuit Upholds Washington's Independent State Grounds Doctrine
Curtis v. Inslee, decided by Ninth Circuit on October 6, 2025, resulted in a defendant win outcome. The Ninth Circuit affirmed the district court's dismissal of a challenge to Washington's "independen...
Eighth Circuit Upholds South Dakota's 'Sanctuary Cities' Ban
Coalition for Humane Immigrant Rights v. Kristi Noem, decided by D.C. Circuit on September 12, 2025, resulted in a defendant win outcome. The Coalition for Humane Immigrant Rights (CHIRLA) challenged ...
State prosecution not barred by federal immunity, court rules
Benjamin Schoenthal v. Kwame Raoul, decided by Seventh Circuit on September 2, 2025, resulted in a defendant win outcome. The Seventh Circuit affirmed the district court's dismissal of Benjamin Schoen...
Fifth Circuit Blocks Texas SB4 Immigration Law as Federal Preemption
La Union del Pueblo Entero v. Abbott, decided by Fifth Circuit on August 29, 2025, resulted in a plaintiff win outcome. The Fifth Circuit Court of Appeals considered whether Texas's SB4 immigration la...
Fifth Circuit Blocks Texas SB4, Upholding Federal Immigration Authority
United States v. State of Texas, decided by Fifth Circuit on August 29, 2025, resulted in a defendant win outcome. The Fifth Circuit reviewed Texas's challenge to the federal government's authority to...
South Dakota's E-Verify law preempted by federal immigration law
Coalition for Humane Immigrant Rights v. Kristi Noem, in her official capacity as Secretary of Homeland Security, decided by D.C. Circuit on August 18, 2025, resulted in a plaintiff win outcome. The C...
Second Circuit Upholds Florida's Ban on Transporting Undocumented Immigrants
Hernandez Flores v. Bondi, decided by Second Circuit on August 14, 2025, resulted in a defendant win outcome. The Second Circuit affirmed the district court's denial of a preliminary injunction sought...
Colorado Supreme Court: Intoxication Doesn't Automatically Invalidate Confession
Jeffery David King v. The People of the State of Colorado, decided by Colorado Supreme Court on August 4, 2025, resulted in a defendant win outcome. The Colorado Supreme Court considered whether a def...
Eighth Circuit: Immigration advocacy group lacks standing to challenge state law
Refugee and Immigrant Center for Education and Le v. Kristi Noem, decided by D.C. Circuit on August 1, 2025, resulted in a defendant win outcome. The Refugee and Immigrant Center for Education and Leg...
Federal instrumentality immune from state subpoena for employee testimony
United States Institute of Peace v. Kenneth Jackson, decided by D.C. Circuit on July 24, 2025, resulted in a defendant win outcome. The case concerns whether the United States Institute of Peace (USIP...
Third Circuit: Private Prison Companies Lack Standing to Challenge State Ban
CoreCivic Inc v. Governor of New Jersey, decided by Third Circuit on July 22, 2025, resulted in a defendant win outcome. The Third Circuit reviewed a challenge to New Jersey's law prohibiting the stat...
Ninth Circuit Upholds Injunction Against South Dakota's "Sanctuary Cities" Law
Immigrant Defenders Law Center v. Noem, decided by Ninth Circuit on July 18, 2025, resulted in a plaintiff win outcome. The Ninth Circuit reviewed a district court's decision to grant a preliminary in...
Fifth Circuit Blocks Texas SB4 Immigration Law
United States v. State of Texas, decided by Fifth Circuit on July 3, 2025, resulted in a defendant win outcome. The Fifth Circuit reviewed Texas's challenge to the federal government's authority to en...
Fifth Circuit Blocks Texas SB4, Upholding Federal Immigration Authority
United States v. State of Texas, decided by Fifth Circuit on July 3, 2025, resulted in a defendant win outcome. The Fifth Circuit reviewed Texas's challenge to the federal government's authority to en...
USIP immune from state court subpoenas, D.C. Circuit rules
United States Institute of Peace v. Kenneth Jackson, decided by D.C. Circuit on July 2, 2025, resulted in a defendant win outcome. The case concerns whether the United States Institute of Peace (USIP)...
SCOTUS Strikes Down Texas 'Save Chick-fil-A' Act as Unconstitutional
Free Speech Coalition, Inc. v. Paxton, decided by Supreme Court of the United States on June 27, 2025, resulted in a defendant win outcome. The Supreme Court considered whether a Texas law, the "Save ...
USIP subject to FOIA for non-governmental activities, D.C. Circuit rules
United States Institute of Peace v. Kenneth Jackson, decided by D.C. Circuit on June 27, 2025, resulted in a plaintiff win outcome. The case concerns whether the United States Institute of Peace (USIP...