What is the standard of review of a motion to suppress?

" 'The standard of appellate review of a trial court's ruling on a motion to suppress is well established. We defer to the trial court's factual findings, express or implied, where supported by substantial evidence. In determining whether, on the facts so found, the search or seizure was reasonable under the Fourth Amendment, we exercise our independent judgment.' " (People v. Weaver (2001) 26 Cal.4th 876, 924, quoting People v. Glaser (1995) 11 Cal.4th 354, 362.) "And where, as is the case here, there is no controversy concerning the underlying facts, our task is simplified: The only issue is

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