In 1842, SCOTUS handed down the terrible decision in Prigg v Pennsylvania.  SCOTUS drastically expanded the federal government’s so-called power under the Necessary and Proper Clause, and made other unconstitutional rulings in this decision. But the one good thing to come out of this decision was that the court held states cannot be “compelled to enforce” the Fugitive Slave Act.  Rather, the national government is responsible for carrying into effect its own policies.  This limitation on congressional power became the foundation for the “anti-commandeering doctrine.” Thus, SCOTUS now holds that Congress lacks the power to “commandeer,” or force, states to implement federal programs.