The following excerpt is from United States v. Parrel, No. 2:12-cr-00244-KJM (E.D. Cal. 2013):
A penal statute or regulation is void for vagueness if it does not "define the criminal offense with sufficient definiteness that ordinary people can understand what conduct is prohibited." Kolender v. Lawson, 461 U.S. 352, 357 (1983). This is the standard because "we assume that man is free to steer between lawful and unlawful conduct . . . [and] [v]ague laws may trap the innocent by not providing fair warning." Id. at 108-09.
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