Cite as: 527 U. S. 41 (1999)
Opinion of Breyer, J.
Nor does it violate "our rules governing facial challenges," post, at 74 (Scalia, J., dissenting), to forbid the city to apply the unconstitutional ordinance in this case. The reason why the ordinance is invalid explains how that is so. As I have said, I believe the ordinance violates the Constitution because it delegates too much discretion to a police officer to decide whom to order to move on, and in what circumstances. And I see no way to distinguish in the ordinance's terms between one application of that discretion and another. The ordinance is unconstitutional, not because a policeman applied this discretion wisely or poorly in a particular case, but rather because the policeman enjoys too much discretion in every case. And if every application of the ordinance represents an exercise of unlimited discretion, then the ordinance is invalid in all its applications. The city of Chicago may be able validly to apply some other law to the defendants in light of their conduct. But the city of Chicago may no more apply this law to the defendants, no matter how they behaved, than it could apply an (imaginary) statute that said, "It is a crime to do wrong," even to the worst of murderers. See Lanzetta v. New Jersey, 306 U. S. 451, 453 (1939) ("If on its face the challenged provision is repugnant to the due process clause, specification of details of the offense intended to be charged would not serve to validate it").
Justice Scalia's examples, post, at 81-83, reach a different conclusion because they assume a different basis for the law's constitutional invalidity. A statute, for example, might not provide fair warning to many, but an individual defendant might still have been aware that it prohibited the conduct in which he engaged. Cf., e. g., Parker v. Levy, 417 U. S. 733, 756 (1974) ("[O]ne who has received fair warning of the criminality of his own conduct from the statute in question is [not] entitled to attack it because the language would not give similar fair warning with respect to other conduct which might be within its broad and literal ambit.
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