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Many nations recognize some form of due process under customary international law. Though the specifics are not clear, there has been general consensus that a nation must guarantee foreign visitors a basic minimum level of justice and fairness.
The Fifth Amendment contains a guarantee of basic due process applicable only to actions of the federal government--"No person shall be...deprived of life, liberty, or property, without due process of law..." The 14th Amendment contains the same verbiage expressly applied to the States. The Supreme Court has interpreted the two clauses identically, so under the federal Constitution, there is no substantial difference in protection from federal or State action. However, State constitutions also have their own guarantees of due process that may, by their own terms or by the interpretation of that State's judiciary, extend even more protection to individuals than under federal law.
The Due Process Clause of the U.S. Constitution is descended from a similar clause of the Magna Carta in which the King of England agreed (in the year 1215 A.D.) that "No Freeman shall be taken, or imprisoned, or be disseised of his Freehold, or liberties, or free Customs, or be outlawed, or exiled, or any otherwise destroyed; nor will we pass upon him, nor condemn him, but by lawful Judgment of his peers, or by the Law of the Land." Thus, the core historical meaning of the Due Process Clause is that the government cannot deprive anyone if the Law of the Land forbids it. In other words, neither the King nor an American President may take away your life, liberty, or property if the law denies him that power.
Due Process under the federal Constitution has additionally been interpreted as a restraint on the ways that legislatures may alter the law, although some judges over the years have objected to stretching the Due Process Clause beyond what was intended by Magna Carta. As a limitation on Congress, the Due Process Clause has been interpreted by the majority of the Supreme Court to have both procedural and substantive components, meaning that it imposes restrictions on legal procedures--the ways in which laws may operate--and also on legal substance--what laws may attempt to do or prohibit. The distinction between substance and procedure is difficult in both theory and practice to establish. Moreover, the substantive component of due process has proven to be very controversial, because it gives the U.S. Supreme Court considerable power to strike down state and federal statutes in order to legalize crimes that a majority of the judges don't think should have been criminalized in the first place.
Procedural due process is essentially based on the concept of procedural fairness. As a bare minimum, it includes an individual's right to be adequately notified of charges or proceedings involving him, and the opportunity to be heard at these proceedings. In criminal cases, fair procedures help to ensure that an accused person will not be subjected to cruel and unusual punishment, which occurs when an innocent person is wrongly convicted.
Criminal prosecutions and civil cases are governed by explicit guarantees of rights under the Bill of Rights and as incorporated under the Fourteenth Amendment to the States (see below). However, when the Constitution has not laid out the specific procedures that must be followed in other government proceedings, due process provides a minumum floor of protection to the individual that statutes, regulations, and enforcement actions must at least meet (but can exceed), in order to ensure that no one is deprived of life, liberty, or property arbitrarily and without opportunity to affect the judgment or result. This minimum protection extends to all government proceedings that can result in an individual's deprivation, whether civil or criminal in nature, from parole violation hearings to administrative hearings regarding government benefits and entitlements to full-blown criminal trials. In criminal cases, many of these due process protections overlap with procedural protections provided by the Eighth Amendment to the United States ConstitutionThe Eighth Amendment to the United States Constitution, which is part of the Bill of Rights, protects against excessive bail or fines, as well as against cruel and unusual punishment. The phrases employed are taken from the English Bill of Rights. Text Ex, which guarantees reliable procedures that protect innocent people from being punished, which would be tantamount to cruel and unusual punishment.