277 (2000) City of Los Angeles v. Alameda Books, Inc., 535 U.S. 41, 51-52 (1986) ("The First Amendment does not require a town, right before enacting this sort of an ordinance, to conduct new scientific studies or develop evidence independent of that currently generated by other towns, so lengthy as whatsoever proof the metropolis depends on is fairly thought to be applicable to the dilemma that the metropolis addresses.").