Criminal law is established by the constitution and cannot be changed

Criminal Codes

Each state decides what conduct to designate a crime.
Thus, each state has its own criminal code.
Congress has also chosen to punish certain conduct, codifying federal criminal law in Title 18 of the U.S.
Code.
Criminal laws vary significantly among the states and the federal government.
While some statutes resemble the common law criminal code, ot.

Ex Post Facto

An ex post facto law retroactively punishes actions.
The Constitution explicitly forbids this practices in Article 1, Sections 9 and 10.

How many crimes does the Constitution recognize?

Although the United States Constitution recognizes only three crimes (counterfeiting, piracy, and treason), it nevertheless plays a significant role in the American criminal justice system.

Sentencing Guidelines

The federal government and state governments have created various sentencing guidelines.
Federal courts use the Federal Sentencing Guidelines, while state courts will look at state-specific sentencing guidelines.

Types of Crimes

Crimes can be generally separated into four categories: felonies, misdemeanors, inchoate offenses, and strict liabilityoffenses.
Each state, and the federal government, decides what sort of conduct to criminalize.
At common law, there were nine major felonies (Murder, Robbery, Manslaughter, Rape, Sodomy, Larceny, Arson, Mayhem, and Burglary) and va.

What is the structure and basic jurisprudence of American criminal law procedure?

This paper explains the structure and basic jurisprudence of United States criminal law procedure.
The foundation of American criminal procedure is the U.S.
Constitution, including:

the first 10 amendments

which form the Bill of Rights.
The Constitution guarantees all persons living in the United States fundamental rights, freedoms, and liberties.

Why is the Federal Constitution applicable in all criminal cases?

As stated earlier in this book, the federal Constitution is applicable in all criminal cases because the government is prosecuting.
State constitutions typically mirror the federal Constitution because it sets the minimum standard of protection that is guaranteed to all citizens.

1791 amendment enumerating rights related to criminal prosecutions

The Sixth Amendment to the United States Constitution sets forth rights related to criminal prosecutions.
It was ratified in 1791 as part of the United States Bill of Rights.
The Supreme Court has applied all but one of this amendment's protections to the states through the Due Process Clause of the Fourteenth Amendment.