What is the test for admitting expert testimony at trial?

"A trial court has broad discretion in determining whether to admit expert testimony and its ruling will be reversed on appeal only where the record reveals an abuse of discretion. [Citations.]" (People v. Ramos (2004) 121 Cal.App.4th 1194, 1205.) We find no abuse of discretion.

Expert opinion testimony is admissible if it relates "to a subject that is sufficiently beyond common experience that the opinion of an expert would assist the trier of fact." (Evid. Code, 801, subd. (a).) "[T]he decisive consideration in determining the admissibility of expert opinion evidence is whether the subject of inquiry is one of such common knowledge that men of ordinary education could reach a conclusion as intelligently as the witness or whether, on the other hand, the matter is sufficiently beyond common experience that the opinion of an expert would assist the trier of fact." (People v. Cole (1956) 47 Cal.2d 99, 103.)