Article 20 of the Constitution of India provides three distinct protections to persons accused of offences: no conviction under an ex post facto criminal law, no double jeopardy for the same offence, and no compulsion to be a witness against oneself. Under Indian law, Article 20 is a fundamental right under Part III that occupies a uniquely protected status — it cannot be suspended even during a national emergency under Article 359, following the 44th Amendment (1978).
Legal definition
The Constitution provides the full text of Article 20:
Article 20(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."
Article 20(2): "No person shall be prosecuted and punished for the same offence more than once."
Article 20(3): "No person accused of any offence shall be compelled to be a witness against himself."
Article 20 codifies three foundational principles of criminal jurisprudence that existed in common law and are also recognised in international human rights instruments. Clause (1) protects against retrospective criminal legislation (ex post facto laws). Clause (2) embodies the rule against double jeopardy (autrefois convict). Clause (3) enshrines the privilege against self-incrimination (nemo tenetur se ipsum accusare). Notably, Article 20 uses "person" rather than "citizen," extending its protection to all persons within Indian territory, including non-citizens.
How courts have interpreted this term
Nandini Satpathy v. P.L. Dani [(1978) 2 SCC 424]
The Supreme Court delivered the most expansive interpretation of Article 20(3) in this case involving corruption charges against the former Chief Minister of Odisha. The Court, through Justice V.R. Krishna Iyer, held that the protection against self-incrimination under Article 20(3) is not confined to testimony in the courtroom but extends to all stages of the criminal process, including police interrogation. The Court held that the phrase "accused of any offence" covers a person against whom a formal accusation has been made or who is likely to be accused, and that "compelled to be a witness" includes compulsion to give oral or written statements that have a tendency to incriminate. This decision established that a suspect has the right to remain silent during police questioning under Section 161(2) of the Code of Criminal Procedure, 1973 (now Section 179 of the BNSS, 2023).
Kedar Nath Bajoria v. State of West Bengal [AIR 1953 SC 404]
The Supreme Court clarified the scope of Article 20(1) by holding that the protection against ex post facto laws applies only to criminal statutes — not to civil or tax legislation. The Court held that a law that merely changes the procedure for trial or the rules of evidence is not an ex post facto law within the meaning of Article 20(1), provided it does not create a new offence or increase the penalty for an existing offence.
Selvi v. State of Karnataka [(2010) 7 SCC 263]
The Supreme Court extended the protection under Article 20(3) to involuntary administration of narcoanalysis, polygraph (lie detector) tests, and brain electrical activation profile (BEAP) tests. The Court held that these techniques constitute testimonial compulsion when administered without the subject's consent and violate both Article 20(3) and Article 21. This landmark decision established that the right against self-incrimination protects not only verbal and written statements but also mental processes that are compulsorily extracted through scientific techniques.
Types of protection under Article 20
Article 20 encompasses three distinct and independent protections:
- Protection against ex post facto laws (Article 20(1)): No person can be convicted for an act that was not an offence when committed, nor subjected to a greater penalty than was prescribed at the time of the offence. This protection applies to substantive criminal law — it does not bar retrospective procedural changes.
- Protection against double jeopardy (Article 20(2)): No person can be prosecuted and punished for the same offence more than once. The protection requires both prosecution and punishment — a mere prosecution that did not result in punishment does not bar a subsequent prosecution.
- Protection against self-incrimination (Article 20(3)): No person accused of an offence can be compelled to be a witness against themselves. This extends to police interrogation, court proceedings, and involuntary scientific tests.
Why this matters
Article 20 occupies a singular position in the fundamental rights framework because of its emergency-proof status. Under Article 359, when a national emergency is proclaimed under Article 352, the President may suspend the right to move courts for enforcement of fundamental rights — but the 44th Amendment (1978) carved out Articles 20 and 21 from this suspension power. This means that even in the gravest constitutional crisis, the protections against ex post facto criminalisation, double jeopardy, and self-incrimination remain fully enforceable.
For criminal defence practitioners, Article 20(3) is the most frequently invoked clause. Its scope, as expanded by Nandini Satpathy and Selvi, provides a robust shield during investigation. A common misunderstanding is that the right against self-incrimination is available only to the accused after charges are framed. In practice, the protection attaches much earlier — it covers any person against whom a formal accusation relating to the commission of an offence has been levelled or who stands in the character of an accused person. This includes the stage of police investigation under Section 161 CrPC (now Section 179 BNSS).
The practical distinction between Articles 20(1) and 20(2) is also significant. Article 20(1) bars conviction under a retrospective law — not prosecution. A person can be tried under a new procedural law for an offence committed before the law was enacted, so long as the substantive offence and penalty remain the same. Article 20(2) requires both prosecution and punishment — an acquittal does not trigger the double jeopardy bar for a subsequent prosecution on different charges arising from the same facts.
Related terms
Broader concepts:
Sibling provisions:
Related enforcement:
Frequently asked questions
Can Article 20 be suspended during a national emergency?
No. Following the 44th Amendment (1978), Article 20 and Article 21 cannot be suspended even during a national emergency under Article 352. The President's power under Article 359 to suspend enforcement of fundamental rights specifically excludes Articles 20 and 21. This means the protections against ex post facto laws, double jeopardy, and self-incrimination remain fully operative at all times.
Does the protection against double jeopardy apply if the accused was acquitted?
Indian law on double jeopardy under Article 20(2) differs from the American Fifth Amendment. Article 20(2) protects against being "prosecuted and punished" — both elements are required. If the first prosecution resulted in acquittal (prosecution without punishment), Article 20(2) does not bar a subsequent prosecution. However, the Code of Criminal Procedure (Section 300 CrPC / Section 337 BNSS) provides a broader statutory protection against successive trials.
Does the right against self-incrimination extend to documents and digital records?
The protection under Article 20(3) applies to testimonial compulsion — it protects against being compelled to give evidence through oral or written statements. The Supreme Court has distinguished between testimonial evidence and physical evidence: compulsory production of documents, DNA samples, fingerprints, or handwriting specimens does not violate Article 20(3) because these constitute real (physical) evidence, not testimonial evidence. However, compulsory narcoanalysis and lie detector tests do violate Article 20(3) as held in Selvi v. State of Karnataka (2010).
Does Article 20(1) prevent the government from increasing penalties retrospectively?
Article 20(1) prohibits subjecting a person to a penalty greater than that which was prescribed at the time of the commission of the offence. If a new law increases the penalty for an existing offence, the enhanced penalty cannot be applied to offences committed before the amendment came into force. However, if the new law reduces the penalty, the beneficial provision may be applied retrospectively under general principles of criminal law.
This entry is part of the Veritect Indian Legal Glossary, a comprehensive reference of Indian legal terminology grounded in statutory text and judicial interpretation.
Last updated: 2026-03-27. Veritect provides this content for informational purposes and does not constitute legal advice.