Practical guidance in the use of expert testimony, including the “flexible” test for qualifying the validity of the scientific evidence of expert witnesses under Rule 702 (per Daubert v. Merrell Dow Pharmaceuticals, Inc., 509 U.S. 579 (1993)). Attorney Epstein concludes that the case law following Daubert and the amendment of Rule 702 in 2000 favors the acceptance of expert testimony.