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On the morning of November 26, 1965, agents of the Federal Bureau of Narcotics entered Webster Bivens's apartment in the Bronx. The agents broke open the door, handcuffed Bivens in front of his wife and young children, and thoroughly searched the apartment. They then transported Bivens to the federal courthouse in Brooklyn, where he was interrogated, booked, and subjected to a visual strip search. Several days later Bivens was released on his own recognizance, and he was never indicted or prosecuted for any offense. Bivens filed suit in the United States District Court for the Eastern District of New York against the six agents in their individual capacities. His complaint sought fifteen thousand dollars in damages from each agent and alleged that the arrest and search were effected without a warrant, that unreasonable force was employed, and that the arrest was made without probable cause. Bivens claimed to have suffered great humiliation, embarrassment, and mental suffering as a result of the agents' conduct. The District Court dismissed the complaint on the ground that it failed to state a cause of action. The United States Court of Appeals for the Second Circuit affirmed the dismissal. The Supreme Court of the United States granted certiorari to review the judgment.

In 1984 the divestiture of AT&T's local telephone business created seven regional service monopolies known as Regional Bell Operating Companies or Incumbent Local Exchange Carriers. More than a decade later Congress enacted the Telecommunications Act of 1996 which restructured local telephone markets and imposed duties on the ILECs to facilitate entry by competitive local exchange carriers through resale of services at wholesale rates, leasing of unbundled network elements, or interconnection of facilities. William Twombly and Lawrence Marcus filed suit in the United States District Court for the Southern District of New York on behalf of a putative class of all subscribers of local telephone and high-speed internet services from February 8, 1996 to the present. They named as defendants four consolidated ILECs: BellSouth Corporation, Qwest Communications International Inc., SBC Communications Inc., and Verizon Communications Inc. The complaint alleged that these ILECs conspired to restrain trade by engaging in parallel conduct to inhibit CLECs, including unfair agreements for network access, inferior connections, overcharging, and billing practices designed to sabotage CLEC customer relations. The complaint further alleged that the ILECs agreed not to compete against one another in their respective territories. This agreement was inferred from their common failure to pursue business opportunities in contiguous markets and from a statement by Qwest CEO Richard Notebaert that competing in another ILEC's territory might be a good way to turn a quick dollar but that does not make it right. The complaint asserted that in light of the absence of meaningful competition among the ILECs and their parallel course of conduct the defendants had entered into a contract combination or conspiracy to prevent competitive entry and to allocate customers and markets. The district court dismissed the complaint for failure to state a claim. It concluded that the alleged parallel behavior was fully explained by each ILEC's independent interest in defending its own territory and that the complaint did not allege facts suggesting the decision to refrain from competing elsewhere was contrary to the ILECs' apparent economic interests. The Court of Appeals for the Second Circuit reversed, holding that plus factors need not be pleaded and that allegations of parallel conduct suffice if they leave open the possibility of collusion. The Supreme Court granted certiorari to address the proper standard for pleading an antitrust conspiracy through allegations of parallel conduct.

The Village of Euclid is an Ohio municipal corporation that adjoins and is practically a suburb of the City of Cleveland. Its estimated population is between 5,000 and 10,000, and its area spans from twelve to fourteen square miles, with the greater part consisting of farm lands or unimproved acreage. It lies roughly in the form of a parallelogram measuring approximately three and one-half miles each way and is traversed east and west by three principal highways and two railroads. Ambler Realty Co. owns a tract of land containing 68 acres situated in the westerly end of the village. This tract abuts on Euclid Avenue to the south and the Nickel Plate railroad to the north. Adjoining this tract on both the east and the west, restricted residential plats have been laid out upon which residences have been erected. On November 13, 1922, the Village Council adopted an ordinance establishing a comprehensive zoning plan. The ordinance divides the village into six use districts denominated U-1 to U-6, three height districts denominated H-1 to H-3, and four area districts denominated A-1 to A-4. Appellee's tract is classified as U-2 for the first 620 feet north of Euclid Avenue, U-3 for the next 130 feet, and U-6 for the remainder. Enforcement of the ordinance is entrusted to the inspector of buildings under rules and regulations of the board of zoning appeals. The board holds public meetings, keeps minutes of its proceedings, and possesses authority to interpret the ordinance in cases of practical difficulty or unnecessary hardship, while penalties are prescribed for violations. Ambler Realty Co. filed suit alleging that the tract has been held for years for sale and development for industrial uses for which it is especially adapted. The bill further alleged that unrestricted market value is about $10,000 per acre but limited to residential purposes the value does not exceed $2,500 per acre, that the first 200 feet back from Euclid Avenue has a value of $150 per front foot if unrestricted but not in excess of $50 per front foot if limited to residential uses, and that the ordinance confiscates and destroys a great part of its value while deterring prospective buyers. The bill sought an injunction restraining enforcement of the ordinance. The district court overruled a motion to dismiss on the ground that the suit was premature. The district court held the ordinance unconstitutional and void and enjoined its enforcement.

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.