Testimony by Expert Witnesses

A witness who is qualified as an expert by knowledge, skill, experience, training, or education, may testify in the form of an opinion or otherwise if: (a) the expert’s scientific, technical, or other specialized knowledge will help the trier of fact to understand the evidence 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 has reliably applied the principles and methods to the facts of the case. 2016 NHRE Update Committee Note The amendments made by supreme court order dated April 20, 2017, effective July 1, 2017, made stylistic changes to the rule and added subsections (b), (c) and (d). For additional guidance regarding the substantive changes to the rule see the notes following Federal Rules of Evidence 702 (Notes of Advisory Committee on 2000 amendment).