California, United States of America
The following excerpt is from Jimenez v. Markets, E067801 (Cal. App. 2018):
His opinion was plainly relevant. It was not speculative; he had reviewed all of the other evidence in the case, and he explained how this evidence supported his opinion. He was not required to have personal knowledge of the underlying facts, because they were shown by other evidence. (Evid. Code, 801, subd. (b); People v. Sanchez (2016) 63 Cal.4th 665, 686.)
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