• In federal court, the admissibility of this testimony is limited to opinions or inferences that are rationally based on the witness’s perception and that will be helpful to a clear understanding of the witness’s testimony or the determination of a fact in issue. Fed. R. Evid. 701. [Cases: Criminal Law 449.1–467; Evidence 470–503.]
lay opinion testimony
Evidence given by a witness who is not qualified as an expert but who testifies to opinions or inferences.