What is the current state of the law on the test for credibility of a psychologist's testimony in a sexual assault case?

"Credibility questions arise whenever the defendant denies the victim's story, explicitly or implicitly suggesting misrecollection or fabrication. If, in every such case, the jury could be informed that a doctor had diagnosed the complainant, based upon the specific facts in the case, as a child molest victim (or rape victim, or whatever), then the protection against misuse of psychologists' testimony erected by Bledsoe would be largely dismantled." ( People v. Roscoe, supra, 168 Cal.App.3d 1093, 1099, 215 Cal.Rptr. 45.)