What is the role of a magistrate in determining whether a defendant is guilty of a crime under section 995 of the California Criminal Code?

"[I]n proceedings under section 995 it is the magistrate who is the finder of fact .... [Citation.]" ( People v. Laiwa (1983) 34 Cal.3d 711, 718, 195 Cal.Rptr. 503, 669 P.2d 1278.) "The magistrate's role is limited by statute to determining whether or not there is sufficient cause to believe the defendant guilty of a public offense. [Citation.] Within the framework of his limited role, however, the magistrate may weigh the evidence, resolve conflicts, and give or withhold credence to particular witnesses. [Citations.]" ( Johnson v. Superior Court (1975) 15 Cal.3d 248, 252, 124 Cal.Rptr. 32, 539 P.2d 792.)

"We conduct an independent review of the evidence, but will not substitute our judgment for that of the magistrate as to the credibility or weight of the evidence. [Citation.]" ( People v. San Nicolas, supra , 34 Cal.4th at p. 654, 21 Cal.Rptr.3d 612, 101 P.3d 509.)