The following excerpt is from U.S. v. Estrada, 967 F.2d 593 (9th Cir. 1992):
A warrantless arrest comports with the Fourth Amendment "only if, at the moment of arrest, facts and circumstances within the arresting officers' knowledge and of which they had reasonably trustworthy information were sufficient to warrant a prudent person in believing that the suspect had committed or was committing an offense." United States v. Pinion, 800 F.2d 976, 979 (9th Cir.1986), cert. denied, 480 U.S. 936 (1987).
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