In reviewing an order denying a motion to suppress, does the court have any authority to review the fact finding of the trial court?

In reviewing an order denying a motion to suppress, we defer to the fact finding of the trial court if there is substantial evidence to support it. (People v. Leyba, supra, 29 Cal.3d 591, 596-597, 174 Cal.Rptr. 867, 629 P.2d 961.) However, we are not bound by the substantial evidence standard in reviewing the trial court's decision whether or not a search or detention was reasonable; instead, it is " 'the ultimate responsibility of the appellate court to measure the facts, as found by the trier, against the constitutional standard of reasonableness.' " (Id., at p. 597, 174 Cal.Rptr. 867, 629 P.2d 961.)