The following excerpt is from U.S. v. Dunn, 935 F.2d 1053 (9th Cir. 1991):
[P]robable cause is a flexible, common-sense standard. It merely requires that the facts available to the officer would "warrant a man of reasonable caution in the belief," Carroll v. United States, 267 U.S. 132, 162 [45 S.Ct. 280, 288, 69 L.Ed. 543] (1925), that certain items may be contraband or stolen property or useful as evidence of a crime; it does not demand any showing that such a belief be correct or more likely true than false.
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