正當法律程序
Due process has also been frequently interpreted as limiting laws and legal proceedings (see substantive due process) so that judges, instead of legislators, may define and guarantee fundamental fairness, justice, and liberty. That interpretation has proven controversial. Analogous to the concepts of natural justice, and procedural justice used in various other jurisdictions, the interpretation of due process is sometimes expressed as a command that the government must not be unfair to the people or abuse them physically. The term is not used in contemporary English law, but two similar concepts are natural justice, which generally applies only to decisions of administrative agencies and some types of private bodies like trade unions, and the British constitutional concept of the rule of law as articulated by A. V. Dicey and others. However, neither concept lines up perfectly with the American theory of due process, which, as explained below, presently contains many implied rights not found in either ancient or modern concepts of due process in England.