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Two minors brought suit against Merrell Dow Pharmaceuticals, claiming they suffered limb reduction birth defects because their mothers had taken Bendectin, a drug prescribed for morning sickness to about 17.5 million pregnant women in the United States between 1957 and 1982. Limb reduction defects occur in fewer than one birth out of every 1000. Scientists do not know the mechanism by which any teratogen causes such defects. The plaintiffs offered testimony from three groups of experts. One group proposed to testify to a statistical link between Bendectin ingestion during pregnancy and limb reduction defects based on reanalyses of published studies that had reported no such association. A second group proposed to testify that Bendectin causes limb reduction defects in humans because it causes such defects in laboratory animals. A third group proposed to testify based on the similarity of Bendectin's chemical structure to other drugs suspected of causing birth defects. The district court granted summary judgment to Merrell Dow after excluding the plaintiffs' expert testimony. The Ninth Circuit affirmed that decision. The Supreme Court granted certiorari, reversed, and remanded for consideration under Federal Rule of Evidence 702. On remand, the Ninth Circuit examined the affidavits and prior trial testimony of the plaintiffs' experts. None of the experts had studied the effect of Bendectin on limb reduction defects before being hired to testify in this or related cases. None had published his work on Bendectin in a scientific journal. The only review their work had received was by judges and juries. Plaintiffs' epidemiological experts made vague assertions of a statistically significant relationship between Bendectin and birth defects but did not state that the relative risk exceeded two. With the exception of Dr. Palmer, the remaining experts were willing to testify only that Bendectin is capable of causing birth defects. Dr. Palmer alone was willing to testify that Bendectin did cause the limb defects in each of the children, based on his review of the plaintiffs' medical records and his conclusion that Bendectin is a teratogen.

In 1967 the Atomic Energy Commission granted Vermont Yankee a construction permit for a nuclear power plant in Vernon, Vermont, after the required adjudicatory hearing and reviews. Vermont Yankee later applied for an operating license; NRDC intervened and objected to exclusion of fuel-reprocessing and waste-disposal impacts from the hearing. In November 1972 the Commission opened a separate rulemaking proceeding on those fuel-cycle issues, noticed two alternative approaches based on its Environmental Survey, and conducted a February 1973 hearing at which more than forty participants submitted comments but no discovery or cross-examination occurred. In April 1974 the Commission adopted a rule assigning numerical values to fuel-cycle impacts and applied it prospectively. In January 1969 Consumers Power applied for permits to build two nuclear reactors in Midland, Michigan. After staff and ACRS review, Saginaw and Mapleton intervened and raised 119 environmental contentions, including seventeen on energy conservation. The Licensing Board held hearings on radiological issues, the staff issued a final environmental impact statement in March 1972, and further hearings occurred in May and June 1972; Saginaw declined to participate in the later hearings or submit proposed findings. The Licensing Board granted the construction permit, the Appeal Board affirmed, and the Commission declined further review. In November 1973 the Commission ruled in another case that energy-conservation evidence meeting threshold tests could be considered, but it later refused Saginaw's motion to reopen the Consumers Power record. NRDC appealed the Vermont Yankee license and rule to the D.C. Circuit; Saginaw and others appealed the Consumers Power permit. In 1976 the Court of Appeals remanded both matters, holding the fuel-cycle rulemaking procedures inadequate, the Consumers Power environmental impact statement defective for omitting energy conservation, and the ACRS report insufficiently explained. The Supreme Court granted certiorari in 1977. The Commission is the successor agency to the Atomic Energy Commission under the Energy Reorganization Act of 1974. All licensing proceedings followed the two-stage process of construction permit followed by operating license under the Atomic Energy Act of 1954, with NEPA environmental reviews added after 1969.

In the late 1990s the city of New London, Connecticut, confronted severe economic decline after the 1996 closure of the Naval Undersea Warfare Center, which had employed more than 1,500 people. The city's unemployment rate stood nearly double the state average and its population had dropped below 24,000 residents from a 1970 high of 30,000. State and local officials therefore designated the Fort Trumbull peninsula for targeted economic revitalization. In 1998 the New London Development Corporation, a private nonprofit entity, was reactivated to prepare a redevelopment plan covering roughly 90 acres. The plan divided the area into seven parcels designated for a waterfront conference hotel and marinas, retail and entertainment space, research and office facilities, parking and park support, residential units, a Coast Guard museum, and additional office and retail uses. The city council formally approved the plan in January 2000 and authorized the NLDC to acquire needed parcels by purchase or, if necessary, by eminent domain. Petitioners Susette Kelo, Wilhelmina Dery, and seven other owners held fifteen properties within parcels 3 and 4A; ten of those parcels were occupied by the owners or their family members and none was alleged to be blighted. After negotiations with the NLDC failed, the corporation initiated condemnation proceedings against the remaining properties in November 2000. In December 2000 the petitioners filed suit in New London Superior Court asserting that the proposed takings violated the public-use limitation of the Fifth Amendment. Following a seven-day bench trial the Superior Court entered a permanent restraining order barring condemnation of the parcel 4A properties but denied relief as to the parcel 3 properties. Both sides appealed to the Connecticut Supreme Court, which upheld the validity of all challenged takings. The United States Supreme Court granted certiorari to review the federal constitutional question.

The Nollans own a beachfront lot in Ventura County, California. A concrete seawall approximately eight feet high separates the beach portion of their property from the rest of the lot. The historic mean high tide line determines the lot's oceanside boundary. The Nollans originally leased their property with an option to buy, and the building on the lot was a small bungalow totaling 504 square feet. The Nollans' option to purchase was conditioned on their promise to demolish the bungalow and replace it. On February 25, 1982, they submitted a permit application to the California Coastal Commission proposing to demolish the existing structure and replace it with a three-bedroom house. The Commission informed them that the permit would be granted subject to the condition that they allow the public an easement to pass across a portion of their property bounded by the mean high tide line and their seawall. On June 3, 1982, the Nollans filed a petition for writ of administrative mandamus in the Ventura County Superior Court to invalidate the access condition. The court remanded the case to the Commission for a full evidentiary hearing. After the hearing, the Commission reaffirmed the condition. The Superior Court ruled in favor of the Nollans on statutory grounds and directed that the permit condition be struck. While the Commission's appeal to the California Court of Appeal was pending, the Nollans tore down the bungalow, built the new house, and bought the property. The Court of Appeal reversed the Superior Court. The Nollans appealed to this Court, raising only the constitutional question.