We’ve chronicled the path of the 2023 amendments to Fed. R. Evid. 702 pretty much from the beginning. As we’ve discussed, those amendments reiterate what had always been (at least since 2000) the Rule’s requirements for analyzing the admissibility of expert witness testimony. But courts had been ignoring critical elements – such as the burden of proof – that had been in comments rather than the black letter of Rule 702 itself. So, as of December 2023, Rule 702 will provide that the proponent of expert testimony must meet all of the Rule’s substantive standards for admissibility by a preponderance of the evidence, and in particular that an adequate basis for such testimony is a prerequisite to admissibility.

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