740
Souter, J., concurring
all. It succeeds in naturally covering any likely address by one person approaching another on a street or parking lot outside a building entrance (aside from common social greetings, protests, or requests for assistance). Someone planning to spread a message by accosting strangers is likely to understand the statute's application to "education." And just because the coverage is so obviously broad, the discretion given to the police in deciding whether to charge an offense seems no greater than the prosecutorial discretion inherent in any generally applicable criminal statute. Cf. Grayned v. City of Rockford, 408 U. S. 104, 108 (1972) (noting that "[v]ague laws may trap the innocent by not providing fair warning" and that "if arbitrary and discriminatory enforcement is to be prevented, laws must provide explicit standards for those who apply them"); Coates v. Cincinnati, 402 U. S. 611, 614 (1971). "[P]erfect clarity and precise guidance have never been required even of regulations that restrict expressive activity." Ward, 491 U. S., at 794.
Although petitioners have not argued that the "floating bubble" feature of the 8-foot zone around a pedestrian is itself a failure of narrow tailoring, I would note the contrast between the operation of subsection (3) and that of the comparable portion of the injunction struck down in Schenck v. Pro-Choice Network of Western N. Y., 519 U. S. 357, 377-379 (1997), where we observed that the difficulty of administering a floating bubble zone threatened to burden more speech than necessary. In Schenck, the floating bubble was larger (15 feet) and was associated with near-absolute prohibitions on speech. Ibid. Since subsection (3) prohibits only 8-foot approaches, however, with the stationary speaker free to speak, the risk is less. Whether floating bubble zones are so inherently difficult to administer that only fixed, no-speech zones (or prohibitions on ambulatory counseling within a fixed zone) should pass muster is an issue neither before us nor well suited to consideration on a facial challenge, cf. Ward, supra, at 794 ("Since respondent does not claim
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