What is the test for a motion to suppress evidence obtained as a result of a search warrant?

A defendant may move to suppress evidence obtained as the result of a search warrant on the ground there was no probable cause for the issuance of the warrant. ( 1538.5, subd. (a)(1)(B)(iii).) If the defendant moves to quash or traverse the search warrant, "the court should proceed to determine whether, under the 'totality of the circumstances' presented in the search warrant affidavit and the oral testimony, if any, presented to the magistrate, there was 'a fair probability' that contraband or evidence of a crime would be found in the place searched pursuant to the warrant. [Citations.]" (People v. Hobbs, supra, 7 Cal.4th at p. 975.) We review the magistrate's decision "simply to ensure that the magistrate had a 'substantial basis for . . . conclud[ing]' that probable cause existed." (Illinois v. Gates (1983) 462 U.S. 213, 238-239.)