The case that established the appropriate standard for expert opinion testimony in most jurisdictions is

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Daubert v. Merrell Dow Pharmaceuticals, Inc. established the standard for expert opinion testimony in federal court, which has been adopted by most jurisdictions. The Daubert standard emphasizes the judge's role as a "gatekeeper" to ensure that expert testimony is based on reliable scientific evidence and methods. The Frye standard, on the other hand, focuses on whether a technique or scientific principle has gained "general acceptance" in the relevant field, and is still followed in a few states.

The Case That Established the Appropriate Standard for Expert Opinion