The following excerpt is from U.S. v. Simpson, 862 F.2d 875 (9th Cir. 1988):
In applying the "substantial basis" standard to a magistrate's determination that probable cause existed for the issuance of a search warrant, we "show great deference to the magistrate's determination," United States v. Estrada, 733 F.2d 683, 684 (9th Cir.), cert. denied, 469 U.S. 850, 861 (1984), and "[w]e may not reverse unless it is clearly erroneous." Id.
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