When reviewing a challenge to a suppression ruling, how do we review the findings of the trial court?

When reviewing a challenge to a suppression ruling, we defer to the trial court's factual findings if supported by substantial evidence, and exercise our independent judgment to determine whether, on the facts found, the search or seizure was reasonable under the Fourth Amendment. (People v. Gallegos (2002) 96 Cal.App.4th 612, 622.) We may affirm the trial court's ruling if it is correct on any theory of law applicable to the case, even if for reasons different than the trial court's reasons. (People v. McDonald (2006) 137 Cal.App.4th 521, 529.)