78
Scalia, J., dissenting
lish that the statute was unconstitutional in all its applications. (I say that is an eminently reasonable requirement, not only because we should not be holding a statute void in all its applications unless it is unconstitutional in all its applications, but also because unless it is unconstitutional in all its applications we do not even know, without conducting an as-applied analysis, whether it is void with regard to the very litigant before us—whose case, after all, was the occasion for undertaking this inquiry in the first place.1)
As we said in United States v. Salerno, 481 U. S. 739, 745 (1987):
"A facial challenge to a legislative Act is, of course, the most difficult challenge to mount successfully, since the challenger must establish that no set of circum-1 In other words, a facial attack, since it requires unconstitutionality in all circumstances, necessarily presumes that the litigant presently before the court would be able to sustain an as-applied challenge. See Hoffman Estates v. Flipside, Hoffman Estates, Inc., 455 U. S. 489, 495 (1982) ("A plaintiff who engages in some conduct that is clearly proscribed cannot complain of the vagueness of the law as applied to the conduct of others. A court should therefore examine the complainant's conduct before analyzing other hypothetical applications of the law"); Parker v. Levy, 417 U. S. 733, 756 (1974) ("One to whose conduct a statute clearly applies may not successfully challenge it for vagueness").
The plurality asserts that in United States v. Salerno, 481 U. S. 739 (1987), which I discuss in text immediately following this footnote, the Court "entertained" a facial challenge even though "the defendants . . . did not claim that the statute was unconstitutional as applied to them." Ante, at 55, n. 22. That is not so. The Court made it absolutely clear in Salerno that a facial challenge requires the assertion that "no set of circumstances exists under which the Act would be valid," 481 U. S., at 745 (emphasis added). The footnoted statement upon which the plurality relies ("Nor have respondents claimed that the Act is unconstitutional because of the way it was applied to the particular facts of their case," id., at 745, n. 3) was obviously meant to convey the fact that the defendants were not making, in addition to their facial challenge, an alternative as-applied challenge—i. e., asserting that even if the statute was not unconstitutional in all its applications it was at least unconstitutional in its particular application to them.
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