Printz v. United States (1997)
The Supreme Court struck down provisions of the Brady Act that required local sheriffs to run background checks on handgun buyers. The Court held that Congress cannot commandeer state executive officials to administer a federal program.
Local law enforcement was no longer obligated to conduct the federal checks.
The anti-commandeering principle became a standard limit on federal power over states, cited across policy areas including elections.
The Ninth Circuit's earlier ruling in United States v. California rests on this line: Washington may ask states to do something, but cannot compel them. The current fight is over whether threats of prosecution count as asking.
