The following excerpt is from USA. v. Gantt, 194 F.3d 987 (9th Cir. 1999):
The government argues that even if a Rule 41(d) violation demanding suppression has occurred, the evidence should not be suppressed under the "good-faith" exception to the exclusionary rule. See United States v. Leon, 468 U.S. 897, 918 (1984). The good-faith exception is not relevant here.
The good-faith exception is applied when a magistrate erroneously issues a warrant but the officers involved are not expected to recognize the mistake. "If the executing officers act in good faith and in reasonable reliance upon a search warrant, evidence which is seized under a facially valid warrant which is later held invalid may be admissible. " United States v. Michaelian,
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