Fifth Amendment to the United States Constitution in the context of "Palko v. Connecticut"

A fair trial is a trial which is "conducted fairly, justly, and with procedural regularity by an impartial judge". Various rights associated with a fair trial are explicitly proclaimed in Article 10 of the Universal Declaration of Human Rights, the Fourth, Fifth, Sixth, Seventh, and Fourteenth Amendments to the United States Constitution, and Article 6 of the European Convention of Human Rights, in addition to numerous other constitutions and declarations throughout the world. There is no binding international law that defines what is not a fair trial; for example, the right to a jury trial and other important procedures vary from nation to nation.

The Double Jeopardy Clause of the Fifth Amendment to the United States Constitution provides: "[N]or shall any person be subject for the same offence to be twice put in jeopardy of life or limb..." The four essential protections included are prohibitions against, for the same offense:

• retrial after an acquittal;
• retrial after a conviction;
• retrial after certain mistrials; and
• multiple punishment

Jeopardy attaches in jury trial when the jury is empaneled and sworn in, in a bench trial when the court begins to hear evidence after the first witness is sworn in, or when a court accepts a defendant's plea unconditionally. Jeopardy does not attach in a retrial of a conviction that was reversed on appeal on procedural grounds (as opposed to evidentiary insufficiency grounds), in a retrial for which "manifest necessity" has been shown following a mistrial, and in the seating of another grand jury if the prior one refuses to return an indictment.

The Fourteenth Amendment (Amendment XIV) to the United States Constitution was adopted on July 9, 1868, as one of the Reconstruction Amendments. Considered one of the most consequential amendments, it addresses citizenship rights and equal protection under the law at all levels of government. The Fourteenth Amendment was a response to issues affecting freed slaves following the American Civil War, and its enactment was bitterly contested. States of the defeated Confederacy were required to ratify it to regain representation in Congress. The amendment, particularly its first section, is one of the most litigated parts of the Constitution, forming the basis for landmark Supreme Court decisions, such as Brown v. Board of Education (1954; prohibiting racial segregation in public schools), Loving v. Virginia (1967; ending interracial marriage bans), Roe v. Wade (1973; recognizing federal right to abortion until overturned in 2022), Bush v. Gore (2000; settling 2000 presidential election), Obergefell v. Hodges (2015; extending right to marry to same-sex couples), and Students for Fair Admissions v. Harvard (2023; prohibiting affirmative action in most college admissions).

The amendment's first section includes the Citizenship Clause, Privileges or Immunities Clause, Due Process Clause, and Equal Protection Clause. The Citizenship Clause broadly defines citizenship, superseding the Supreme Court's decision in Dred Scott v. Sandford (1857), which held that Americans descended from African slaves could not become American citizens. The Privileges or Immunities Clause was interpreted in the Slaughter-House Cases (1873) as preventing states from impeding federal rights, such as the freedom of movement. The Due Process Clause builds on the Fifth Amendment to prohibit all levels of government from depriving people of life, liberty, or property without substantive and procedural due process. Additionally, the Due Process Clause supports the incorporation doctrine, by which portions of the Bill of Rights have been applied to the states. The Equal Protection Clause requires each state to provide equal protection under the law to all people, including non-citizens, within its jurisdiction.

In United States constitutional law, state action is an action by a person who is acting on behalf of a governmental body, and is therefore subject to limitations imposed on government by the United States Constitution, including the First, Fifth, and Fourteenth Amendments, which prohibit the federal and state governments from violating certain rights and freedoms.

Substantive due process is a principle in United States constitutional law that allows courts to establish and protect substantive laws and certain fundamental rights from government interference, even if they are unenumerated elsewhere in the U.S. Constitution. Courts have asserted that such protections stem from the due process clauses of the Fifth and Fourteenth Amendments to the U.S. Constitution, which prohibit the federal and state governments, respectively, from depriving any person of "liberty ... without due process of law." Substantive due process demarcates the line between acts that courts deem subject to government regulation or legislation and those they consider beyond the reach of governmental interference. Whether the Fifth or Fourteenth Amendments were intended to serve that function continues to be a matter of scholarly and judicial discussion and dissent.

Substantive due process is to be distinguished from procedural due process. The distinction arises from the words "of law" in the phrase "due process of law". Procedural due process protects individuals from the coercive power of government by ensuring that adjudication processes, under valid laws, are fair and impartial. Such protections, for example, include sufficient and timely notice of why a party is required to appear before a court or other governmental body, the right to an impartial trier of fact and trier of law, and the right to give testimony and present relevant evidence at hearings. In contrast, substantive due process protects individuals against majoritarian policy enactments that exceed the limits of governmental authority: courts may find that a majority's enactment is not law and cannot be enforced as such, even if the processes of enactment and enforcement were actually fair.

A Due Process Clause is found in both the Fifth and Fourteenth Amendments to the United States Constitution, which prohibit the deprivation of "life, liberty, or property" by the federal and state governments, respectively, without due process of law.

The U.S. Supreme Court interprets these clauses to guarantee a variety of protections: procedural due process (in civil and criminal proceedings); substantive due process (a guarantee of some fundamental rights); a prohibition against vague laws; incorporation of the Bill of Rights to state governments; and equal protection under the laws of the federal government.

Public use is a legal requirement under the Takings Clause ("nor shall private property be taken for public use without just compensation") of the Fifth Amendment of the U.S. Constitution, that owners of property seized by eminent domain for "public use" be paid "just compensation."

The distinction between public use and public purpose has created a doctrinally confusing and highly controversial subset of public use doctrine. This controversy was renewed after the Supreme Court's decision in Kelo v. City of New London (2005). In that decision, the Court upheld the precedent regarding economic development takings set forth in Hawaii Housing Authority v. Midkiff and Berman v. Parker, and permitted, in a 5–4 decision, the taking of private property that was to be transferred to a private developer. In United States v. Gettysburg Electric Ry. Co., 160 U.S. 668 (1896), the Supreme Court ruled in 1896 that seizing the railway for Gettysburg Battlefield historic preservation "seems" to be "a public use".