What is the test for admitting or excluding expert testimony at trial?

Expert testimony is admissible on any subject sufficiently beyond common experience such that the opinion of an expert would assist the trier of fact. (Evid. Code, 801, subd. (a); People v. Brown (2004) 33 Cal.4th 892, 905.) A trial court has broad discretion in deciding whether to admit or exclude expert testimony, and its decision will

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