Under Article 20(2) of the Constitution, no person can be prosecuted and punished more than once for the same offence. What is this protection commonly called?

Double jeopardy. This is the protection against double jeopardy. It stops a second prosecution and punishment for the same offence, once a person has already faced trial for it. Read more: Polity0234 — Article 20: Double Jeopardy, Ex Post Facto Laws, Self-Incrimination.

Who receives the constitutional protections under Article 20?

Every person, including foreign nationals. Article 20 protects persons, rather than only Indian citizens. Foreign nationals can therefore claim its protections too. It addresses retrospective criminal punishment, double jeopardy and compelled self-incrimination. Article 19 differs because its listed freedoms are guaranteed to citizens. Polity0234 — Article 20: Double Jeopardy, Ex Post Facto Laws, Self-Incrimination

In Maqbool Hussain v. State of Bombay (1953), the Supreme Court ruled that Article 20(2)'s double jeopardy protection does not cover:

Confiscation proceedings by Customs authorities. The Court held that Customs authorities are not a judicial court, so their confiscation action isn't a 'prosecution.' A later criminal trial for the same conduct is not double jeopardy. Read more: Polity0234 — Article 20: Double Jeopardy, Ex Post Facto Laws, Self-Incrimination.

During a National Emergency, Article 359 lets the President suspend the right to move courts to enforce most Fundamental Rights. Which amendment excluded Articles 20 and 21 from this suspension, and in what year?

The 44th Amendment, 1978. The 44th Amendment of 1978 excluded Articles 20 and 21 from suspension under Article 359. So even during a National Emergency, a person can still approach a court to enforce these two rights. Read more: Polity0234 — Article 20: Double Jeopardy, Ex Post Facto Laws, Self-Incrimination.

In Selvi v. State of Karnataka (2010), the Supreme Court held that involuntary narcoanalysis, polygraph, and brain-mapping tests on an accused violate Article 21, along with which other Article?

Article 20(3), the right against self-incrimination. The Court held that forcing these tests on an unwilling accused violates Article 20(3). Results from involuntary tests cannot be used as evidence. Read more: Polity0234 — Article 20: Double Jeopardy, Ex Post Facto Laws, Self-Incrimination.

Which among the following fundamental rights is/are available to non-citizens? 1. Freedom of speech. 2. Protection against self-incrimination. 3. Freedom of conscience. 4. Non-discrimination in matters of employment. Select the correct answer using the code given below.

2 and 3 only. The answer is 2 and 3 only. Protection against self-incrimination (Article 20) and freedom of conscience (Article 25) apply to all persons. Freedom of speech and non-discrimination in employment are reserved for citizens.

Article 20: Double Jeopardy, Ex Post Facto Laws, Self-Incrimination

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. It protects citizens and non-citizens alike.

20(1) No ex post facto criminal law.

20(2) No double jeopardy.

20(3) No self-incrimination.

Who “Any person”, including non-citizens.

Ex post facto law: A law applied to acts done before it existed.

Double jeopardy: Prosecuted and punished twice for the same offence.

Self-incrimination: Being forced to testify against yourself.

Compelled testimony: Spoken or written statements forced from the accused.

Contents

Chapter 1: Three Protections in One Article
Chapter 2: The Limits of Each Shield
Chapter 3: The Famous Cases
Chapter 4: Why the Accused Needed a Shield
Chapter 5: Real Questions

1Chapter 1: Three Protections in One Article

Must Know

The three shields

20(1) Ex post facto laws: you cannot be convicted, or given a heavier 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 more than once.
20(3) Self-incrimination: a person accused of an offence cannot be compelled to be a witness against themselves.

Who 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.

Exam shortcut

Article 20 protects the accused.
Article 22 protects the arrested.
Do not mix them up.
Read more: Article 22: Preventive Detention and Article 21: Right to Life and Personal Liberty.

Remember: 20(1) law. 20(2) twice. 20(3) self.

True or False: Article 20 protects only Indian citizens.

2Chapter 2: The Limits of Each Shield

Must Know

Criminal only

Article 20 blocks only criminal liability.
Retrospective civil liability and departmental inquiries are outside it.

Clause by clause

20(1): bars only criminal laws applied retroactively. A heavier penalty must have existed in law at the time of the act.
20(2): needs a real prosecution and punishment. A departmental action is not a second prosecution, so the clause does not trigger.
20(3): protects only compelled testimony. If the accused voluntarily gives documents or speaks, that is not self-incrimination.
Each clause fails when its condition is missing.
That is exactly how exams test the limits. Check the condition first.

True or False: A departmental inquiry after a criminal trial is not double jeopardy under Article 20(2).

3Chapter 3: The Famous Cases

Good to Know

Two cases

Maqbool Hussain (1953): 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 Oghad (1961): the Court said forcing someone to give a specimen signature or thumb impression is not self-incrimination. It is not testimony.
Testimony means spoken or written statements.
Case law decides what counts as “prosecution” and “compelled testimony”. These are the two words exams keep testing.

True or False: Giving a thumb impression under compulsion violates Article 20(3).

4Chapter 4: Why the Accused Needed a Shield

Great to Know

Colonial memory

The framers wrote Article 20 after watching British India’s arbitrary criminal laws, including laws that punished acts retroactively.
In 1947-49, the Constituent Assembly debated whether the protections should cover only citizens.
They chose “any person”. Wider is safer.

Not suspendable

Article 20 cannot be suspended even during an Emergency.
The accused keeps this shield whatever the crisis.
The framers believed no crisis justifies punishing a person under a law made after the act.
Read more: Fundamental Rights: A Complete Guide and Article 32.

In everyday cases

Every criminal trial touches Article 20.
Retroactive laws, second trials and forced confessions keep coming up in court.
Recent rulings on confessions, illegal detention and retrospective tax penalties keep Article 20 central in criminal-justice debates.

Think it through: Think it through: why is the double-jeopardy shield limited to “prosecuted and punished”?

If every follow-up action counted, a government employee convicted in court could never face a disciplinary inquiry. The shield targets real criminal punishment twice, not other kinds of accountability.

True or False: Article 20 cannot be suspended during an Emergency.

5Chapter 5: Real Questions

Exam Angle

Past questions

CDS I 2020: which Article protects against double jeopardy? Article 20. Articles 21, 22 and 23 protect other rights. See the question.
CAPF 2026: statements on 20(1), the ex post facto clause. It bans retroactive criminal conviction and heavier retroactive penalties. Trap options deny one of these. See the question.
CDS II 2021: which rights are available to non-citizens? Protection against self-incrimination is one. See the question.

True or False: Protection against self-incrimination is available to non-citizens too.

Quick Q&A

Double jeopardy clause? 20(2).
Ex post facto clause? 20(1).
Self-incrimination clause? 20(3).
Who is protected? Any person.
Suspendable? No.

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