Also known as: legal theories · jurisprudence · legal philosophy
Written by attorneys — see sources below.
A principle or set of principles on which a litigant bases claims or defenses in a case. The term identifies the doctrinal foundation that supports a party's position and guides the presentation of evidence and argument.
Linden Bank sued a borrower for default and its counsel prepared internal memos analyzing possible contract defenses. When the borrower sought those memos in discovery, the court reviewed the request under the work-product rule. Because the memos contained the bank's attorney's legal theories about litigation strategy, the court refused to order their production even though the underlying facts were discoverable.
Logan Lane, injured by a train in Pennsylvania, sued the railroad in federal court asserting a negligence theory drawn from state common law. The court applied the state rule rather than a general federal standard because the legal theory of liability arose under state law.
Tompkins, a citizen of Pennsylvania, was injured on a dark night by a passing freight train of the Erie Railroad Company while walking along its right of way at Hughestown in that State. He claimed that the accident occurred through negligence in the operation or maintenance of the train. He asserted that he was rightfully on the premises as a licensee because he was on a commonly used beaten footpath which ran for a short distance alongside the tracks. He further alleged that he was struck by something which looked like a door projecting from one of the moving cars. To enforce that claim he brought an action in the federal court for southern New York, which had jurisdiction because the company is a corporation of that State. The Erie insisted that its duty to Tompkins was no greater than that owed to a trespasser. It contended, among other things, that its duty to Tompkins, and hence its liability, should be determined in accordance with the Pennsylvania law; that under the law of Pennsylvania, as declared by its highest court, persons who use pathways along the railroad right of way are to be deemed trespassers; and that the railroad is not liable for injuries to undiscovered trespassers resulting from its negligence, unless it be wanton or wilful. Tompkins denied that any such rule had been established by the decisions of the Pennsylvania courts. He contended that, since there was no statute of the State on the subject, the railroad's duty and liability is to be determined in federal courts as a matter of general law. The trial judge refused to rule that the Pennsylvania law precluded recovery. The jury brought in a verdict of $30,000. The judgment entered thereon was affirmed by the Circuit Court of Appeals, which held that it was unnecessary to consider whether the law of Pennsylvania was as contended, because the question was one not of local, but of general, law and that upon questions of general law the federal courts are free, in the absence of a local statute, to exercise their independent judgment as to what the law is. Because of the importance of the question whether the federal court was free to disregard the alleged rule of the Pennsylvania common law, the Supreme Court granted certiorari.
View caseLuke Latham and his partner challenged a state marriage ban by asserting a substantive due process theory that the right to marry extends to same-sex couples. The court accepted that legal theory and held the ban unconstitutional.
The petitioners were fourteen same-sex couples and two men whose same-sex partners were deceased. They lived in Michigan, Kentucky, Ohio, and Tennessee. Those states defined marriage as a union between one man and one woman under their constitutions and statutes. The petitioners filed suits in federal district courts in their home states. They sought marriage licenses or recognition of marriages lawfully performed elsewhere. James Obergefell and John Arthur traveled from Ohio to Maryland to marry aboard a medical transport plane because Arthur suffered from ALS; Obergefell later sought to be listed as surviving spouse on Arthur's death certificate. April DeBoer and Jayne Rowse, Michigan nurses, adopted three children but could not both serve as legal parents under state adoption rules. Army Reserve Sergeant Ijpe DeKoe and Thomas Kostura married in New York before DeKoe's deployment to Afghanistan and later settled in Tennessee. Each district court ruled in the petitioners' favor. The respondents appealed. The Sixth Circuit consolidated the cases and reversed the district court judgments. The petitioners sought certiorari, which the Supreme Court granted. Same-sex couples had begun establishing families after substantial cultural and political developments in the late twentieth century. Earlier litigation had addressed the legal status of gays and lesbians, including challenges that reached the Supreme Court in Bowers v. Hardwick and Lawrence v. Texas.
View caseLena Lawson owned waterfront property condemned by the city for economic redevelopment. She advanced a takings theory that the public-use requirement barred transfer to private developers. The court rejected that legal theory and upheld the condemnation.
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.
View caseLaura Lewis, a clinic director, sued to enjoin a state statute requiring spousal notice before an abortion. She relied on a substantive due process theory protecting a woman's autonomy in reproductive decisions. The court applied that legal theory to strike down the notice requirement.
The Pennsylvania Abortion Control Act of 1982, as amended in 1988 and 1989, established several requirements governing the performance of abortions within the Commonwealth. The Act required a woman seeking an abortion to provide informed consent after receiving specific information from a physician or counselor at least twenty-four hours before the procedure. It mandated that a minor obtain the informed consent of one parent, subject to a judicial bypass option. It further required a married woman to sign a statement confirming that she had notified her husband of her planned abortion, unless certain exceptions applied. The Act also imposed reporting obligations on facilities providing abortion services and defined a medical emergency exception to the various requirements. Before any of these provisions took effect, the petitioners brought suit in the United States District Court for the Eastern District of Pennsylvania. The petitioners were five abortion clinics and one physician representing himself as well as a class of physicians who provide abortion services. They sought declaratory and injunctive relief and challenged each provision as unconstitutional on its face. The District Court entered a preliminary injunction. After conducting a three-day bench trial, the District Court held all the provisions unconstitutional and entered a permanent injunction against their enforcement by Pennsylvania. The Court of Appeals for the Third Circuit affirmed in part and reversed in part. It adopted the District Court's factual findings and legal analysis except with respect to the spousal notification requirement. The Court of Appeals upheld the spousal notification requirement as constitutional and applied the undue burden standard in evaluating the provisions. The Supreme Court granted certiorari to consider the constitutionality of the challenged provisions of the Pennsylvania statute.
View caseLucia Lopez, an Oregon resident, obtained a default judgment against a New York defendant who had never entered Oregon. When she sought to enforce the judgment, the defendant contested it under a due process theory requiring minimum contacts with the forum. The court accepted that legal theory and refused enforcement.
In February 1866, J.H. Mitchell obtained a judgment in an Oregon circuit court against Neff for less than $300 in an action for attorney services. At that time, Neff resided outside Oregon, received no personal service of process, and made no appearance in the case. The judgment was entered by default following constructive service by publication as authorized by the Oregon Code for non-resident defendants possessing property within the state. The Oregon Code also provided for attachment of a non-resident's property in money actions. No such attachment occurred with respect to the land at issue. Instead, after the judgment, an execution issued, leading to a levy on the land and its sale at a sheriff's auction. Pennoyer purchased the property at that sale and received a sheriff's deed. Separately, in 1866, the United States issued a patent to Neff for the same tract of land under the Donation Law of Oregon, which Neff valued at $15,000. Neff then brought suit against Pennoyer in the circuit court to recover possession of the premises based on his patent title. The lower court held the Oregon judgment invalid because of deficiencies in the affidavits used to obtain the publication order and to prove publication occurred. The Supreme Court of the United States granted review to consider the validity of the state court judgment and the resulting sheriff's sale.
View caseThe doctrine protects against disclosure of an attorney's mental impressions, conclusions, opinions, or legal theories concerning the litigation. A court that orders discovery of work-product materials must still shield those protected elements from disclosure.
Different legal theories rest on distinct doctrinal principles even when they arise from the same facts. A plaintiff may plead both a federal statutory claim and related state-law tort theories, and each theory supplies its own elements and remedies.
No. Absent privity or representation, nonparties are not bound by a prior judgment. A second plaintiff may therefore advance the identical legal theory against the same defendant.