The following excerpt is from Campos v. City of San Diego, 46 F.3d 1139 (9th Cir. 1995):
We likewise reject Flores' argument that the district court abused its discretion in excluding from evidence the dismissal of criminal charges against Flores. The court correctly determined that the evidence was not relevant to the issue of whether the officers had probable cause to arrest Flores. Probable cause is determined at the moment of arrest, United States v. Hillison, 733 F.2d 692, 697 (9th Cir.1984), and not in hindsight based upon the ultimate disposition of criminal charges.
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