Convicted under a law that did not exist when you acted. Tried twice for the same crime. Forced to testify against yourself. Article 20 is the Constitution’s triple shield against these three abuses of state power — and it applies to citizens and non-citizens alike.
CONSTITUTION OF INDIAArticle 20
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(1) No person shall be convicted of any offence except for violation of a law in force at the time of the commission of the act charged as an offence, nor be subjected to a penalty greater than that which might have been inflicted under the law in force at the time of the commission of the offence. (2) No person shall be prosecuted and punished for the same offence more than once. (3) No person accused of any offence shall be compelled to be a witness against himself.
Article 20(1) bans ex post facto laws, 20(2) bans double jeopardy, and 20(3) bans self-incrimination. All three apply to ‘any person’ — not just citizens.
mcqquestion.com · Indian Polity🛡️ Exam Edge
🛡️ Article 20: The Triple Shield
Three protections for the accused — available to every person, citizen or not.
20(1)No ex post facto criminal law
20(2)No double jeopardy
20(3)No self-incrimination
Any personCitizens and non-citizens both
Not civilProtects against criminal, not civil, liability
ExamWhich Article bans double jeopardy = 20
💡The trap: Article 20 protects against criminal prosecutions only — departmental inquiries and civil suits are outside it.
mcqquestion.comUPSC · CDS · NDA · CAPF · SSC
Must Know
Three Protections in One Article
- 20(1)Ex post facto laws: you cannot be convicted or given a bigger penalty under a law that did not exist when you did the act. The law must be in force at the time of the act.
- 20(2)Double jeopardy: you cannot be prosecuted and punished for the same offence twice. Once you have been tried and punished, the state cannot come after you again for the same act.
- 20(3)Self-incrimination: if you are accused of an offence, you cannot be forced to be a witness against yourself. No one can compel you to give testimony that convicts you.
- WhoWho gets these rights? The clauses say ‘any person’ — so even non-citizens are protected. You do not need to be an Indian citizen to claim Article 20.
- So whatThe quick exam shortcut: Article 20 protects the accused; Article 22 protects the arrested. Do not mix them up.
The Limits of Each Shield
- Criminal onlyThe big limit: Article 20 blocks only criminal liability. Retrospective civil liability and departmental inquiries are outside it.
- 20(1) scopeWhat does 20(1) actually bar? Only criminal laws applied retroactively. A heavier penalty must have existed in the law at the time of the act.
- 20(2) scopeWhat does 20(2) need? A real prosecution and punishment. A departmental action is not a second prosecution, so it does not trigger the clause.
- 20(3) scopeWhat does 20(3) protect? Only compelled testimony. If the accused voluntarily gives documents or speaks, that is not self-incrimination.
- So whatEach clause fails when its condition is missing. That is exactly how exams test the limits — check the condition first.
Good to Know
The Famous Cases
- Maqbool HussainIn Maqbool Hussain, the Supreme Court said proceedings under the Sea Customs Act were not a ‘prosecution’ — so a later criminal trial was not double jeopardy.
- Kathi Kalu OghadIn Kathi Kalu Oghad, the Court said forcing someone to give a specimen signature or thumb impression is not self-incrimination — it is not testimony.
- So whatCase-law decides what counts as ‘prosecution’ and ‘compelled testimony’ — the two words exams keep testing.
- Kathi Kalu OghadCompelling a person to give a specimen signature or thumb impression is not self-incrimination — testimony means spoken or written statements.
- So whatCase-law decides what counts as ‘prosecution’ and ‘compelled testimony’ — the two words exams test.
✅ Test Yourself
Work through a 5-question chain on Article 20, then keep practising with a random Indian Polity question.
Great to Know
Why the Accused Needed a Shield
- Colonial memoryThe framers wrote Article 20 after watching British India’s arbitrary criminal laws, including laws that punished acts retroactively.
- 1947In the Constituent Assembly, the debate was whether these protections should cover only citizens. They chose ‘any person’ — wider is safer.
- Not suspendableOne more point: Article 20 cannot be suspended even during an Emergency. The accused keeps this shield no matter what.
- So whatThe framers believed no crisis justifies punishing a person under a law made after the act — so this right is absolute even in emergencies.
- Non-suspendableArticle 20 is one of the few rights that cannot be suspended even during Emergency — it protects the accused always.
PYQ / Exam Angle
CDS I 2020: Which Article Bans Double Jeopardy
- QuestionCDS and other competitive exams ask which Article protects a person against double jeopardy — the answer is Article 20.
- WhyArticle 20(2) is exactly the double-jeopardy clause. Articles 21, 22 and 23 protect other rights, not this one.
- LinkSource: CDS I 2020 (see Q74).
CAPF 2026: Statements on Article 20(1)
- QuestionCAPF and other competitive exams ask which statements about Article 20(1) are correct — the ex post facto clause.
- Why20(1) bans retroactive criminal conviction and heavier retroactive penalties. The trap options usually deny one of these two things.
- LinkSource: CAPF AC 2026 (see Q55).
CDS II 2021: Rights of Non-Citizens
- QuestionCDS and other competitive exams ask which fundamental rights are available to non-citizens — protection against self-incrimination is one of them.
- WhyArticle 20(3) says ‘no person accused of any offence’ — the word is ‘person’, so citizenship does not matter.
- LinkSource: CDS II 2021 (see Q78).
Current Affairs / So What
The Shield in Everyday Cases
- Why it mattersEvery criminal trial touches Article 20: retroactive laws, second trials and forced confessions keep coming up in court.
- So whatArticle 20 is the constitutional answer to three of the most common abuses of prosecution power you will read about in the news.
- DevelopmentRecent rulings on confessions, illegal detention and retrospective tax penalties keep Article 20 at the centre of criminal-justice debates.
Beyond the answer
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