Definition
Law with retrospective effect.
Law making act criminal which was not so at time of commission.
Statutory Definition
Article 20(1) Constitution.
Etymology & Origin
Latin phrase meaning 'from a thing done afterward'. It refers to a law that retroactively changes the legal consequences of actions that were committed before the enactment of the law.
Full Legal Analysis
An Ex Post Facto Law is a law that applies retroactively to punish actions that were legal when they were committed, or to increase the penalty for a crime beyond what was prescribed at the time the offence occurred. The Indian Constitution strictly prohibits the enactment and application of such retrospective criminal laws.
This protection ensures fairness and predictability in law. A citizen cannot be punished for an act if, on the day they did it, the act was not a crime. Similarly, if the punishment for a crime is increased (e.g., from 3 years to 7 years) after the crime was committed, the offender can only be subjected to the original 3-year punishment.
Importantly, this protection only applies to substantive criminal laws that create new offences or increase punishments. It does not apply to civil liabilities (like retrospective taxation) or purely procedural criminal laws (changes in the process of trial or evidence).
The Supreme Court held that if a subsequent law reduces the punishment for an offence, the accused can claim the benefit of the reduced punishment, as Article 20(1) only prohibits the imposition of a 'greater' penalty.
Advocates frequently invoke Article 20(1) when new, stringent economic or penal laws are enacted, ensuring clients are tried only under the softer provisions that existed at the time of the alleged incident.
This Term in Indian Statutes
Constitution of India, 1950
"Protection in respect of conviction for offences (Prohibition of ex post facto criminal laws)."
Ensures no one is punished for acts that were not illegal when committed.
