The following excerpt is from United States v. Andujo, 20-50043 (9th Cir. 2021):
If a party preserves his or her claim of error on a district court's evidentiary ruling, this court reviews for abuse of discretion. United States v. Perez, 962 F.3d 420, 434 (9th Cir. 2020). But if a witness's opinion was not objected to at trial, the plain-error standard applies. Id.
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