The following excerpt is from U.S. v. Roberts, 747 F.2d 537 (9th Cir. 1984):
5 See also United States v. Humphries, 636 F.2d 1172 (9th Cir.1980), cert. denied, 451 U.S. 988, 101 S.Ct. 2324, 68 L.Ed.2d 846 (1981) (agent's trespass onto a private driveway to determine the license plate number of a car parked in the driveway did not violate the Fourth Amendment).
6 See Aguilar v. Texas, 378 U.S. 108, 84 S.Ct. 1509, 12 L.Ed.2d 723 (1964); Spinelli v. United States, 393 U.S. 410, 89 S.Ct. 584, 21 L.Ed.2d 637 (1969).
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