Wyo. R. Prac. & P. 701
As amended through April 30, 2019
If the witness is not testifying as an expert, his testimony in the form of opinions or inferences is limited to those opinions or inferences which are (a) rationally based on the perception of the witness and (b) helpful to a clear understanding of his testimony or the determination of a fact in issue.
Wyo. R. Prac. & P. 701