Jury instructions regarding expert witnesses in Wyoming are not readily accessible in jury instruction handbooks as jury instructions in other states are. However, case law provides insight as to what the jury is instructed in Wyoming in regard to expert witnesses. First, expert witnesses are allowed to testify as to their opinion on the case at hand as long as “their opinions were rationally based on their own perceptions and helpful to clear understanding of testimony or determination of fact in issue.” Caterpillar Tractor Co. v. Donahue, 674 P.2d 1276 (Wyo. 1983). Additionally, if an expert testifies to something that conflicts with another expert’s testimony, the jury is to decide which testimony to believe. See Stoner v. Mau, 72 P. 193 (Wyo. 1903).
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