F

A claim that a statute is unenforceable as it is unconstitutional on its face. '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 circumstances exists under which the Act would be valid. The fact that [the regulations] might operate unconstitutionally under some conceivable set of circumstances is insufficient to render [them] wholly invalid.' United States v. Salerno, 481 U. S. 739, 481 U. S. 745 (1987). 

When a facial challenge is successful, the law in question is declared to be unenforceable in all its ...