The following excerpt is from U.S. v. Peral-Cota, 988 F.2d 125 (9th Cir. 1993):
a substantial risk of harm to the persons involved or to the law enforcement process would arise if the police were to delay a search until a warrant could be obtained. The need for an immediate search must be apparent to the police, and so strong as to outweigh the important protection of individual rights provided by the warrant requirement. There must be no practical way to avoid these risks and yet follow the Constitution's mandate of detached judicial supervision of such intrusions.
United States v. Robertson, 606 F.2d 853, 859 (9th Cir.1979).
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