The Court ruled that Congress may not commandeer state executive officers to administer a federal handgun background-check program. Federal law can regulate gun sales directly, but it cannot make local sheriffs carry out federal tasks.
The case challenged temporary provisions of the Brady Act that required local chief law enforcement officers to perform background checks until a federal system was ready. Printz was decided with Mack v. United States.
May Congress require state and local executive officers to perform federal handgun background checks under the Brady Act, or does that command violate the anti-commandeering principle?
Congress cannot require state and local executive officers to administer a federal regulatory program. The Brady Act's interim command that chief local law enforcement officers perform handgun background checks violated the Constitution's federal structure, even though states remained free to help voluntarily.
How the justices lined up in this decision.
Printz strengthened the anti-commandeering rule. It limits Congress's ability to use state officials as federal administrators, while leaving room for voluntary state cooperation and direct federal enforcement. The immediate effect on gun checks was limited because the federal NICS system soon replaced the interim local-check system.
Justice Scalia wrote for a five-justice Court joined by Chief Justice Rehnquist and Justices O'Connor, Kennedy, and Thomas. Justices O'Connor and Thomas also wrote concurrences. Justice Stevens dissented, joined by Justices Souter, Ginsburg, and Breyer.