California, United States of America
The following excerpt is from People v. Morris, H046686 (Cal. App. 2020):
" '[E]xpert opinion testimony " 'will be excluded only when it would add nothing at all to the jury's common fund of information, i.e., when "the subject of inquiry is one of such common knowledge that [those with] ordinary education could reach a conclusion as intelligently as the witness" ' [citation]." [Citation.]' [Citation.]" (People v. Brown, supra, 59 Cal.4th at p. 101.)
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