In the American federal system, there are limitations on national government's ability to carry out its policies through the executive branch of state governments. For example, in Printz v. United States, 521 U.S. 898 (1997) the Court held that the national government could not directly require state law enforcement officers to conduct background checks under the Brady firearms legislation. The court explained that prior decisions warned that "this Court never has sanctioned explicitly a federal command to the States to promulgate and enforce laws and regulations." And yet, there are significant advantages in a federal system to obtain state assistance in the local implementation of federal programs. Implementing such programs through national employees would significantly increase the size and intrusiveness of the national government. Moreover, local implementation may assure that these programs are implemented in ways that take local conditions into account.