What is probable cause in a malicious prosecution case?

In the malicious prosecution context, probable cause is a suspicion founded on circumstances sufficiently strong to warrant a reasonable man to believe that the charge is true. Centers v. Dollar Markets, 99 Cal.App.2d 534, 540, 222 P.2d 136, 141 (1950). To succeed on a malicious prosecution claim, amongst other factors, the plaintiff must prove that the defendant did not have reasonable grounds for believing that the facts alleged in the criminal complaint were true. Id. at 540, 222 P.2d at 141.