The Constitutional Topics pages at the USConstitution.net site are presented to delve deeper into topics than can be provided on the Glossary Page or in the FAQ pages. This Topic Page concerns Due Process. Due Process is mentioned in two places in the Constitution; in the 5th Amendment and in the 14th Amendment.
Due process is a difficult thing to define, and the Supreme Court has not been much help over the years. Here's what we can say about due process:
In the Magna Carta, due process is referred to as "law of the land" and "legal judgment of peers." Some state constitutions continue to use these phrases.
The reference in the 5th Amendment applies only to the federal government and its courts and agencies. The reference in the 14th Amendment extends protection of due process to all state governments, agencies, and courts.
Due process, in the context of the United States, refers to how and why laws are enforced. It applies to all persons, citizen or alien, as well as to corporations.
In that, the "how" is procedural due process. Is a law too vague? Is it applied fairly to all? Does a law presume guilt? A vagrancy law might be declared too vague if the definition of a vagrant is not detailed enough. A law that makes wife beating illegal but permits husband beating might be declared to be an unfair application. A law must be clear, fair, and have a presumption of innocence to comply with procedural due process.
The "why" is substantive due process. Even if an unreasonable law is passed and signed into law legally (procedural due process), substantive due process can make the law unconstitutional. The Roe v Wade abortion decision declared a Texas law in violation of due process and ruled that in the first trimester, it is unreasonable for a state to interfere with a woman's right to an abortion; during the second trimester, it is reasonable for a state to regulate abortion in the interest of the health of mothers; and in the third, the state has a reasonable interest in protecting the fetus. Another application has been to strike down legislation requiring certain non-dangerous mentally ill persons be confined against their will.
Generally, due process guarantees the following (this list is not exhaustive):
These pages also examine the topic of Due Process: