California, United States of America
The following excerpt is from People v. Goodwin, B197574 (Cal. App. 2015):
An expert may offer an opinion on "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); People v. Mayfield (1997) 14 Cal.4th 668, 766.) An expert is qualified if he or she " 'has sufficient skill or experience in the field so that his [or her] testimony
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