What is the test for credibility of witness testimony in a civil case?

court's credibility determination. Hernandez claims his "account is both more detailed and more plausible" than the testimony of the officers involved. But this court must be deferential to the trial court's credibility determination if supported by substantial evidence. (People v. Soun, supra, 34 Cal.App.4th at p. 1507.) We then use our independent judgment to determine if the facts found by the trial court establish a seizure in violation of the Fourth Amendment. (Ibid.)