What rules apply where evidence consists of expert opinion?

The same rules apply where the evidence consists of expert opinion. It is well established that a trier of fact is not automatically required to render a verdict [that] conforms to ... expert opinion, even if unanimous. (People v. Drew (1978) 22 Cal.3d 333, 350, 149 Cal.Rptr. 275, 583 P.2d 1318 ; see People v. Samuel (1981) 29 Cal.3d 489, 498, 174 Cal.Rptr. 684, 629 P.2d 485 [trier of fact is not required to accept at face value a unanimity of expert opinion].) To hold otherwise would be in effect to substitute a trial by experts' for a trial by jury.... (

[61 Cal.4th 219]