What is the term for a criminal statute that punishes actions retroactively?

• A. Ex Post Facto
• B. Habeas Corpus
• C. Due Process
• D. Bill of Rights

Answer: (A)

Retroactive criminal punishment is described by ex post facto. An ex post facto law applies to actions that occurred before the law was passed, either making a previously legal act illegal or increasing the penalties after the fact. The U.S. Constitution prohibits such laws in criminal matters, protecting people from being punished for acts that weren’t crimes at the time they were committed.

Habeas Corpus is a procedure demanding that a person in custody be brought before a court to determine the legality of detention, not about retroactive punishment. Due Process refers to fair and proper legal procedures and safeguards. The Bill of Rights is the collection of the first ten amendments protecting individual rights, not a term describing retroactive punishment.