What is the test required to establish probable cause for a search warrant?

"The showing required in order to establish probable cause is less than a preponderance of the evidence or even a prima facie case. (Illinois v. Gates, supra, 462 U.S. at p. 235.)" (People v. Carrington (2009) 47 Cal.4th 145, 163.) "The pertinent rules governing a Fourth Amendment challenge to the validity of a search warrant, and the search conducted pursuant to it, are well-settled. 'The question facing a reviewing court asked to determine whether probable cause supported the issuance of the warrant is whether the magistrate had a substantial basis for concluding a fair probability existed

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