Is probable cause for arrest based on information provided by a single informer?

The case of Aitken v. White, 93 Cal.App.2d 134, 208 P.2d 788, which was cited by the court, is not authority for the proposition that information given by a single informer, without knowledge of any other facts, is sufficient to constitute probable cause. In that action, which was one for false arrest and imprisonment, the court held it error to refuse to receive into evidence the report of a detective agency concerning the plaintiff, and which had been received by the defendant prior to his placing the plaintiff under arrest, holding that

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