What is the test for a motion to suppress evidence?

In evaluating a challenge to the trial court's ruling on a motion to suppress evidence, we view the record in the light most favorable to the trial court's ruling and defer to its factual findings, whether express or implied, if they are supported by substantial evidence. "'[A]ll factual conflicts must be resolved in the manner most favorable to the ^erior court's disposition on the [ suppression] motion.' [Citation.]" (People v. Woods (1999) 21 Cal.4th 668, 673-674.) We then exercise our independent judgment to decide what legal principles are relevant, independently apply them to the facts, and determine as a matter of law whether the search was unreasonable. (People v. Glaser (1995) 11 Cal.4th 354, 362.)