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Criminal Due Process

Singapore Article 11 Retrospective Laws & Double Jeopardy Guide 2026

Complete legal guide to Article 11 of the Singapore Constitution. Explains protection against retrospective criminal laws, double jeopardy, & acquittal rules.

Overview & Statutory Background

Article 11 of the Constitution of the Republic of Singapore safeguards criminal due process and procedural fairness. Article 11(1) enshrines the fundamental principle *nullum crimen sine lege* (no crime without law), prohibiting retrospective criminal legislation and forbidding heavier penalties than those existing at the time the offense was committed. Article 11(2) enshrines protection against double jeopardy, prohibiting a person who has been acquitted or convicted of an offense from being tried again for the same offense (except where an conviction/acquittal is set aside on appeal). Use this guide to understand Singapore criminal procedure rights under the Constitution.

Key Pass Highlights & Statutory Criteria

No Retrospective Laws

Nullum Crimen Sine Lege

Verified

Double Jeopardy Ban

Autrefois Acquit / Convict

Verified

Constitutional Provision

Article 11(1) & 11(2)

Verified

Governing Code

Criminal Procedure Code (CPC)

Verified

Evaluation Criteria & Points Breakdown

Article 11(1) Ban on Retrospective Criminal Laws

Art 11(1)

No person shall be punished for an act or omission that was not punishable by law when done, nor subjected to heavier penalties than existing when committed.

Article 11(2) Double Jeopardy Protection

Art 11(2)

Bars re-prosecution or double trial for an offense for which a person has already been lawfully acquitted or convicted by a competent court.

Autrefois Acquit & Autrefois Convict Pleas

Special CPC Pleas

Procedural pleas under the Criminal Procedure Code (CPC Section 244) allowing defendants to dismiss repeated charges.

Appellate Court Retrial Exceptions

Appellate Exception

Double jeopardy does not prevent a higher appellate court (Court of Appeal) from ordering a retrial upon setting aside a lower court verdict.

Mandatory Eligibility Requirements

Article 11 protections apply to all persons accused of criminal offenses in Singapore.

Penal laws passed by Parliament cannot retroactively criminalize past lawful conduct.

Acquittal by a court of competent jurisdiction permanently bars retrial on the same factual charge.

Criminal procedure is governed by the Supreme Court and State Courts under the Criminal Procedure Code (CPC).

Step-by-Step Application & Issuance Process

Examine Date of Alleged Offense & Law Enactment Date

Verify that the criminal statute was enacted and in force prior to the date of the alleged conduct.

File Special Plea of Autrefois Acquit / Convict

Defense counsel submits CPC plea asserting defendant was previously tried and acquitted/convicted of the same offense.

State Courts / High Court Determination

Trial judge reviews previous trial record and dismisses second charge if double jeopardy applies.

Challenge Retrospective Statutory Penalty Increases

Challenge executive attempts to apply newly increased statutory sentences to offenses committed before enactment.

Court of Appeal Final Criminal Ruling

Court of Appeal issues binding ruling confirming Article 11 criminal due process protections.

Required Document Checklist

•Constitution of the Republic of Singapore Article 11 Official Text

•Criminal Procedure Code (CPC Cap. 68 SSO AGC statutory text)

•Certified Copy of Court Judgment of Acquittal / Conviction

•Notice of Charge / Charge Sheet issued by Attorney-General's Chambers (AGC)

•High Court / Court of Appeal Criminal Motion Application

Frequently Asked Questions (FAQ)

Article 11(1) guarantees that no person can be convicted of an act that was not a crime at the time it was committed, nor subjected to a greater penalty than what was prescribed when the offense occurred.

Double Jeopardy means that a person who has already been tried and acquitted or convicted of an offense by a court cannot be tried again for the same offense.

These are formal legal defenses under the Criminal Procedure Code allowing an accused person to object to a trial on the grounds that they have already been acquitted (autrefois acquit) or convicted (autrefois convict) of the charge.

No. Under Article 11(1), Parliament is constitutionally forbidden from enacting retrospective criminal laws that create offenses for past actions.

No. Article 11(2) specifically allows retrials or appeals ordered by a higher appellate court where the original acquittal or conviction is quashed on appeal.

Yes. Article 11 protects 'any person', extending retrospective law and double jeopardy protections to foreign nationals tried in Singapore courts.