Cite as: 521 U. S. 898 (1997)
Opinion of the Court
211, 239-240 (1995) (holding legislated invalidation of final judgments to be categorically unconstitutional). We expressly rejected such an approach in New York, and what we said bears repeating:
"Much of the Constitution is concerned with setting forth the form of our government, and the courts have traditionally invalidated measures deviating from that form. The result may appear 'formalistic' in a given case to partisans of the measure at issue, because such measures are typically the product of the era's perceived necessity. But the Constitution protects us from our own best intentions: It divides power among sovereigns and among branches of government precisely so that we may resist the temptation to concentrate power in one location as an expedient solution to the crisis of the day." 505 U. S., at 187.
We adhere to that principle today, and conclude categorically, as we concluded categorically in New York: "The Federal Government may not compel the States to enact or administer a federal regulatory program." Id., at 188. The mandatory obligation imposed on CLEOs to perform background checks on prospective handgun purchasers plainly runs afoul of that rule.
V
What we have said makes it clear enough that the central obligation imposed upon CLEOs by the interim provisions of the Brady Act—the obligation to "make a reasonable effort to ascertain within 5 business days whether receipt or possession [of a handgun] would be in violation of the law, including research in whatever State and local recordkeeping systems are available and in a national system designated by the Attorney General," 18 U. S. C. § 922(s)(2)—is unconstitutional. Extinguished with it, of course, is the duty implicit in the background-check requirement that the CLEO accept notice of the contents of, and a copy of, the completed Brady
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