Daubert and Expert Testimony of Impairment

Published for NC Criminal Law on July 01, 2014.

With the amendment of Rule 702 of the North Carolina Rules of Evidence in 2011, North Carolina became a Daubert state. That change means that trial judges in this state, like their federal counterparts, serve as gatekeepers when faced with a proffer of expert testimony. See Daubert v. Merrell Dow Pharmaceuticals, 509 U.S. 579 (1993) (interpreting the role of the judge under Rule 702 of the Federal Rules of Evidence, which is substantially similar to amended N.C. Evid. R. 702). The judge must determine, at the outset, whether the expert is purporting to testify to scientific, specialized or technical knowledge that will assist the trier of fact to understand or determine a fact in issue. Kumho Tire v. Carmichael, 526 U.S. 137 (1999) (recognizing applicability of Daubert principles to all types of expert testimony admitted under Rule 702). This requires the court to preliminarily assess whether the reasoning or methodology underlying the testimony is scientifically valid and whether that reasoning or methodology can be applied to the facts in issue. Factors that may be relevant to that consideration are whether the theory or technique upon which the expert relies has been tested, whether it has been subject to peer review or publication, the known or potential rate of error, and whether the theory or technique enjoys general acceptance within the relevant scientific community. She blinded me with science. The purpose of these requirements is to ensure that expert testimony is reliable and relevant. The gatekeeper “make[s] certain that an expert, whether [...]