What is the test for establishing probable cause to set aside or prohibit the prosecution of an allegation of sexual assault?

The principles determining whether probable cause supports an information are well settled. "An information will not be set aside or a prosecution thereon prohibited if there is some rational ground for assuming the possibility that an offense has been committed and the accused is guilty of it. [Citations.]" (People v. Slaughter (1984) 35 Cal.3d 629, 637, 200 Cal.Rptr. 448, 677 P.2d 854.) "[A]lthough there must be some showing as to the existence of each element of the charged crime [citation] such a showing may be made by means of circumstantial evidence supportive of reasonable inferences on the part of the magistrate." (Williams v. Superior [203 Cal.App.3d 1508] Court (1969) 71 Cal.2d 1144, 1148, 80 Cal.Rptr. 747, 458 P.2d 987.) Moreover, every legitimate inference from the evidence must be drawn in favor of the information. (Ibid.)