Practice Tip: Daubert's 'Fit' Requirement

Daubert requires that federal district court judges engage in a two-prong inquiry when addressing the admissibility of expert testimony. The district court must determine that an expert's proffered testimony has both a reliable foundation and an adequate fit. While many courts have addressed in-depth the first prong of this Daubert test, less attention has been paid to the second prong, the “fit” requirement. Among the courts that have engaged in a substantive “fit” analysis, the majority have focused on whether the expert's proffered testimony is sufficiently tied to the facts of the case or the issues presented to the trier of fact. Under this type of analysis, the courts essentially ask the question “is this testimony relevant?”