Daubert v. Merrell Dow Pharmaceuticals, Inc.

Holding that a trial judge must ensure that all admitted expert testimony "is not only relevant, but reliable"

Kumho Tire Co. v. Carmichael

Holding that the Daubert gatekeeping standard applies not only to "scientific testimony" but also to "all expert testimony"

General Electric Co. v. Joiner

Holding that under the abuse of discretion standard the appellate court will not reverse unless the ruling is manifestly erroneous

Comcast Corp. v. Behrend

Holding that at the class certification stage, "any model supporting a plaintiff's damages case must be consistent with its liability case"

Tyson Foods, Inc. v. Bouaphakeo

Holding "persuasiveness is, in general, a matter for the jury" and not grounds for denying class certification unless "no reasonable juror could have believed" plaintiffs' evidence of an essential element of their claim

In re Paoli R.R. Yard PCB Litigation

Holding an expert's testimony unreliable because he did not consider alternative causes

Miles v. Merrill Lynch & Co.

Holding that district court must make a "definitive assessment of Rule 23 requirements" and "resolve[] . . . factual disputes relevant to each Rule 23 requirement"

Amorgianos v. National R.R. Passenger Corp.

Holding that we undertake a Daubert analysis "without regard to the conclusions the expert has reached or [our] belief as to the correctness of those conclusions"

Nimely v. City of New York

Holding that the district court erred in admitting testimony of an expert who "stated that he ‘rejected’ the possibility that [law-enforcement witnesses] had lied, and explained various reasons why police officers have no incentive to give false statements in excessive force cases"

In re TMI Litigation

Holding that a District Court properly excluded expert testimony where the sole basis for the testimony was summaries prepared by a party's attorney

Rule 26 - Duty to Disclose; General Provisions Governing Discovery

Adopting Fed.R.Civ.P. 37

Rule 23 - Class Actions

Holding that, to certify a class, the court must find that "questions of law or fact common to class members predominate over any questions affecting only individual members"

Rule 702 - Testimony by Expert Witnesses

Adopting the Daubert standard

Rule 401 - Test for Relevant Evidence

Providing that evidence is relevant if " it has any tendency to make a fact more or less probable than it would be without the evidence; and (b) the fact is of consequence in determining the action"

Rule 402 - General Admissibility of Relevant Evidence

Providing relevant evidence is admissible unless prohibited by the United States Constitution, a federal statute, the Federal Rules of Evidence, or other rules prescribed by the Supreme Court

Rule 704 - Opinion on an Ultimate Issue

Rejecting as "empty rhetoric" the notion that some expert testimony is inadmissible because it usurps the "province of the jury."

Section 1604 - Value of property; owner as competent witness

Section 1410 - Groundwater; right of action