How is insufficient evidence determined in a sexual assault case?

Insufficiency of the evidence claims are reviewed by giving great deference to the decision of the trial court. Evidence is sufficient to support a conviction if, reviewing the evidence in the light most favorable to the prosecution, "any rational trier of fact could have found the essential elements of the crime beyond a reasonable doubt." United States v. Adler, 879 F.2d 491, 495 (9th Cir.1989) (emphasis in original) (citation omitted). Circumstantial evidence and inferences drawn from it may be sufficient to sustain a conviction. United States v. Hernandez, 876 F.2d 774, 780 (9th Cir.1989), cert. denied, 493 U.S. 863 (1989).