Here’s a timely reminder that Federal Rule of Evidence 702 (the basis of the Supreme Court’s famous Daubert decision) imposes a four-part test. For expert opinion testimony to be admissible, the fact that the expert has “scientific, technical, or other specialized knowledge [that] will help the trier of fact to understand the evidence or to determine a fact in issue” [Fed. R. Evid. 702(a)] is necessary, but not sufficient.
