Kumho Tire Co. v. Carmichael, 526 U.S. 137 (1999), is a United States Supreme Court case that applied the Daubert standard to expert testimony from non-scientists. Background Patrick Carmichael was driving his minivan on July 6, 1993, when the right rear tire blew out. One of the passengers in the vehicle died, and others were severely injured. Three months later, the Carmichaels sued the manufacturer of the tire, claiming that the tire was defective and the defect caused the accident. The Carmichaels' case rested largely on testimony from a tire failure expert. The tire failure expert relied on features of tire technology that the manufacturer did not dispute, as well as background facts about the particular tire on the Carmichaels' van. The expert's conclusion that a defect in the tire caused the accident rested on certain observations about the tire that Kumho Tire vigorously disputed. Kumho also disagreed with certain aspects of the tire expert's methodology, and asked the federal district court hearing the case to exclude it under Rule 702 of the Federal Rules of Evidence. The district court took its cue from Daubert v. Merrell Dow Pharmaceuticals, which had solidified a gatekeeping role for trial judges in admitting expert testimony. Under Daubert, certain factors contribute to the reliability, and hence the admissibility, of expert testimony, one of which is the general validity of the expert's methods. The district court found the tire expert's methods not to be scientifically valid, and hence excluded his testimony. This resulted in a conclusion that Kumho Tire would prevail. The Carmichaels appealed to the Eleventh Circuit. The Eleventh Circuit reversed the district court's ruling. It reasoned that Daubert was expressly limited only to scientific expert testimony and did not apply to "skill- or experience-based observation." The tire expert's testimony rested on such unscientific "observation and experience", and so the Eleventh Circuit reasoned the district court should have made a different ruling based on their legal reasoning over Rule 702 without the Daubert gloss. Kumho Tire asked the Supreme Court to review whether Daubert applied solely to scientific evidence. Majority opinion The Court found in the text of Rule 702, a codification of Daubert, a gatekeeping function for federal trial judges who had to determine whether expert scientific testimony was admissible in a federal trial. But Rule 702 applies to "scientific, technical, or other specialized knowledge." "This language makes no relevant distinction between 'scientific'