California, United States of America
The following excerpt is from People v. Elkins, D075724 (Cal. App. 2021):
Such testimony is admissible. A percipient witness may offer opinion testimony when the "witness's impression of what he or she observes regarding the appearance and demeanor of another rests on 'subtle or complex interactions' between them [citation] or when it is impossible to otherwise adequately convey to the jury the witness's concrete observations." (People v. DeHoyos (2013) 57 Cal.4th 79, 130.) A percipient witness's
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