928
Opinion of the Court
some felony-investigation time, and permitting at least some background checks beyond one-half hour would certainly not be unreasonable. Is this decision whether to devote maximum "reasonable efforts" or minimum "reasonable efforts" not preeminently a matter of policy? It is quite impossible, in short, to draw the Government's proposed line at "no policymaking," and we would have to fall back upon a line of "not too much policymaking." How much is too much is not likely to be answered precisely; and an imprecise barrier against federal intrusion upon state authority is not likely to be an effective one.
Even assuming, moreover, that the Brady Act leaves no "policymaking" discretion with the States, we fail to see how that improves rather than worsens the intrusion upon state sovereignty. Preservation of the States as independent and autonomous political entities is arguably less undermined by requiring them to make policy in certain fields than (as Judge Sneed aptly described it over two decades ago) by "reduc-[ing] [them] to puppets of a ventriloquist Congress," Brown v. EPA, 521 F. 2d, at 839. It is an essential attribute of the States' retained sovereignty that they remain independent and autonomous within their proper sphere of authority. See Texas v. White, 7 Wall., at 725. It is no more compatible with this independence and autonomy that their officers be "dragooned" (as Judge Fernandez put it in his dissent below, 66 F. 3d, at 1035) into administering federal law, than it would be compatible with the independence and autonomy of the United States that its officers be impressed into service for the execution of state laws.
The Government purports to find support for its proffered distinction of New York in our decisions in Testa v. Katt, 330 U. S. 386 (1947), and FERC v. Mississippi, 456 U. S. 742 (1982). We find neither case relevant. Testa stands for the proposition that state courts cannot refuse to apply federal law—a conclusion mandated by the terms of the Supremacy Clause ("the Judges in every State shall be bound [by federal
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