The following excerpt is from Unger v. U.S., 110 F.3d 70 (9th Cir. 1997):
2 In this context, a regulation which on its face impinges on protected rights of expression by, for example, prohibiting the possession of books on certain topics, is nonetheless "neutral" where distinctions between types of printed or graphic material are distinguished solely on the basis of their implications for prison security. Thornburgh v. Abbott, 490 U.S. at 415-16.
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