Bob T. Moore and Susan Moore v. Ashland Chemical, Inc. And Ashland Oil, Inc.

DENNIS, Circuit Judge:

In this negligence case, we are called upon to determine the standards for assessing the reliability of the proffer of a clinical physician’s expert opinion as to the cause of a plaintiffs disease in the light of Daubert v. Merrell Dow Pharmaceuticals, Inc., 509 U.S. 579, 113 S.Ct. 2786, 125 L.Ed.2d 469 (1993). We conclude that: (1) the basic principles of the Federal Rules of Evidence recognized by Daubert apply to the admission or exclusion of every type of expert testimony; (2) a trial judge, therefore, must assess every proffer of expert testimony to determine…