Testimony by Expert Witnesses

A witness who is qualified as an expert by knowledge, skill, ex- perience, training, or education may testify in the form of an opinion or otherwise if the proponent demonstrates to the court that it is more likely than not that: Rule 703 FEDERAL RULES OF EVIDENCE 16 (a) the expert’s scientific, technical, or other specialized knowledge will help the trier of fact to understand the evi- dence or to determine a fact in issue; (b) the testimony is based on sufficient facts or data; (c) the testimony is the product of reliable principles and methods; and (d) the expert’s opinion reflects a reliable application of the principles and methods to the facts of the case. (As amended Apr. 17, 2000, eff. Dec. 1, 2000; Apr. 26, 2011, eff. Dec. 1, 2011; Apr. 24, 2023, eff. Dec. 1, 2023.)