California, United States of America
The following excerpt is from People v. Alvarez, H043801 (Cal. App. 2018):
" 'The trial court's determination of whether a witness qualifies as an expert is a matter of discretion and will not be disturbed absent a showing of manifest abuse. [Citation.] " 'Where a witness has disclosed sufficient knowledge of the subject to entitle his opinion to go to the jury, the question of the degree of his knowledge goes more to the weight of the evidence than to its admissibility.' " [Citation.]' [Citation.]" (People v. Nelson (2016) 1 Cal.5th 513, 536.)
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