Which term refers to a law that retroactively criminalizes an action?

Which term refers to a law that retroactively criminalizes an action?

• A. Public interest
• B. Habeas corpus
• C. Ex post facto law
• D. Writ

Answer: (C)

This question tests understanding of laws that apply retroactively to criminalize actions. An ex post facto law is one that makes illegal something someone did before the law existed or increases penalties for a crime after it was committed. That retroactive change undermines fairness because people should only be judged by the laws in effect at the time they acted, not by laws written later. Public interest refers to the welfare of the community and isn’t about criminalizing past actions. Habeas corpus is a procedure that protects against unlawful detention. A writ is a formal order issued by a court. None of these describe retroactively criminalizing an act, which is specifically the realm of ex post facto law.

This question tests understanding of laws that apply retroactively to criminalize actions. An ex post facto law is one that makes illegal something someone did before the law existed or increases penalties for a crime after it was committed. That retroactive change undermines fairness because people should only be judged by the laws in effect at the time they acted, not by laws written later.

Public interest refers to the welfare of the community and isn’t about criminalizing past actions. Habeas corpus is a procedure that protects against unlawful detention. A writ is a formal order issued by a court. None of these describe retroactively criminalizing an act, which is specifically the realm of ex post facto law.