Jury instructions regarding expert witnesses are outlined in Model Utah Jury Instructions, Rule 121. Model Utah Jury Instr. 121 (2014). This rule instructs the jury on the factors that should be considered when the jury evaluates a witness’s testimony. Id. The jury is allowed to believe or disregard an expert’s testimony given the credibility factors outlined in the rule. Id. The factors the jury should consider are the expert’s personal interest, bias, demeanor, consistency, knowledge, memory, and reasonableness. Id. Further, if experts testify to conflicting conclusions, the jury should consider the testimonies and qualifications of each expert and determine which testimony should be given more weight. Id.
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