Expert witness quote, Daubert

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"To summarize: 'general acceptance' is not a necessary precondition to the admissibility of scientific evidence under the Federal Rules of Evidence, but the Rules of Evidence--especially Rule 702--do assign to the trial judge the task of ensuring that an expert's testimony both rests on a reliable foundation and is relevant to the task at hand. Pertinent evidence based on scientifically valid principles will satisfy those demands."

Daubert v. Merrell Dow Pharmaceuticals, 509 U.S. 579 (1993).