A minivan’s right rear tire blew out, causing a crash that killed one passenger and seriously injured others. The plaintiffs sued Kumho Tire, alleging the tire was defectively manufactured or designed, and relied heavily on tire-failure expert Dennis Carlson. Carlson used a visual-inspection methodology to infer that because the tire did not show enough signs of overdeflection or other misuse, a defect must have caused the tread separation and blowout. The district court excluded Carlson’s testimony as unreliable under Federal Rule of Evidence 702 and Daubert, then granted summary judgment for Kumho; the Eleventh Circuit reversed, reasoning Daubert applied only to scientific testimony, not experience-based technical testimony.
Does the trial judge’s Daubert gatekeeping obligation under Federal Rule of Evidence 702 apply to technical and other specialized expert testimony, and may the judge use Daubert’s reliability factors flexibly in assessing such testimony?
Federal Rule of Evidence 702 requires trial judges to ensure that all expert testimony—scientific, technical, or otherwise specialized—is relevant and reliable. Daubert’s specific factors, such as testing, peer review, error rate, and general acceptance, may be considered when helpful, but the reliability inquiry is flexible and the trial court has broad discretion in both choosing the factors and deciding admissibility.
Yes. Daubert’s gatekeeping obligation applies to all expert testimony under Rule 702, not just scientific testimony. The district court acted within its discretion in applying a flexible reliability analysis and excluding Carlson’s testimony.
The Court emphasized that Rule 702’s text covers “scientific, technical, or other specialized knowledge,” so its reliability requirement cannot be limited to science alone. Daubert itself grounded the gatekeeping role in the word “knowledge” and in the special latitude given to expert witnesses, which applies across expert fields. Because there is no workable line separating scientific from technical expertise, trial judges must be able to screen all expert evidence for reliability. The Court also held that Daubert’s listed factors are not a mandatory checklist; judges have broad latitude to decide which factors fit the particular expertise at issue, and the district court did not abuse its discretion in finding Carlson’s method unreliable.
Kumho Tire extended Daubert beyond strictly scientific testimony and made clear that Rule 702 imposes a general reliability gatekeeping duty for all expert evidence. It also confirmed that the Daubert factors are flexible rather than mandatory, giving trial courts substantial discretion over both methodology and admissibility. The case, together with Daubert v. Merrell Dow Pharmaceuticals, Inc., 509 U.S. 579 (1993), and General Electric Co. v. Joiner, 522 U.S. 136 (1997), forms the core modern framework for federal expert-testimony admissibility.
Daubert v. Merrell Dow Pharmaceuticals, 509 U.S. 579 (1993) |
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General Electric Co. v. Joiner, 522 U.S. 136 (1997) |
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