Final answer:
The non-required element of a due process system is 'It must be predictably effective.' Due process ensures government accountability, just laws, and open government, as well as protection under the law as per the Fifth and Fourteenth Amendments.
Step-by-step explanation:
The requirement of a due process system that is not necessary is 'It must be predictably effective.' While due process mandates that procedures must follow clear rules and not be arbitrary, be well documented, and be perceived as equitable, it does not guarantee predictability in effectiveness. The key aspects of due process include accountability, just laws, and open government, ensuring that government and private actors are accountable under the law and no one is above the law. It also implies that laws must be clear, publicized, stable, applied evenly, and protect fundamental rights.
Due process is a legal requirement that the government respect the rights of individuals, a hallmark of the rule of law and a balance between government power and individual rights. It is entrenched in the US Constitution, specifically within the Fifth and Fourteenth Amendments, which state that no individual should be deprived of life, liberty, or property without due process of law.