The following excerpt is from U.S. v. Ruddell, 71 F.3d 331 (9th Cir. 1995):
An affidavit in support of an anticipatory search warrant must show that the property sought is on a sure course to the destination targeted for the search. See United States v. Hale, 784 F.2d 1465, 1468-69 (9th Cir.), cert. denied, 479 U.S. 829, 107 S.Ct. 110, 93 L.Ed.2d 59 (1986). "[A] controlled delivery pursuant to a warrant issued earlier is ... permissible." Hale, 784 F.2d at 1469.
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