...testimony by any expert and that "[t]he trial judges in all cases of expert testimony must find it is properly grounded, well-reasoned, and not speculative before it can be admitted." The Committee Note points out that if a witness is relying primarily on experience to reach an opinion,...

...qualifications, their conclusions and their assurances of reliability. Under Daubert, that's not enough.") The more subjective and controversial the expert's...likely the testimony should be excluded as unreliable. See James R. O'Conner, Plaintiff-Appellant, v. Commonwealth Edison Company and London Nuclear Services,...