The Constitution of India
Article 20
Protection in respect of conviction for offences
(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.
Why this exists
These protections were included by the Constitution's framers to prevent the kind of abuses associated with colonial and authoritarian criminal justice systems — retroactive punishment, repeated harassment through multiple prosecutions, and coerced confessions extracted through pressure or torture. They draw on similar protections found in the US Constitution (ex post facto clause, double jeopardy, and the Fifth Amendment right against self-incrimination) and reflect a broader commitment to fair criminal procedure and individual dignity.
How courts read it
Courts have clarified the boundaries of each clause. On clause (1), courts have held that only criminal, not civil or tax, retrospective laws are barred, and that procedural changes (like new courts or evidence rules) do not violate it. On clause (2), in Maqbool Hussain v. State of Bombay, the Supreme Court held that double jeopardy protection applies only where there was a prior prosecution and punishment before a court or judicial tribunal, not mere departmental or administrative action. On clause (3), in State of Bombay v. Kathi Kalu Oghad, the Court held that giving fingerprints, handwriting samples, or physical specimens does not amount to being a 'witness' against oneself, narrowing the clause's scope to testimonial compulsion. Later, in Selvi v. State of Karnataka (2010), the Supreme Court ruled that involuntary narco-analysis, polygraph, and brain-mapping tests violate Article 20(3), reinforcing that compelled testimonial acts — even scientific ones — are protected against.
Common misconceptions
- Myth: Article 20(2) means you can never face two different legal actions for the same act.
Fact: Courts have held it applies only to repeated prosecution and punishment in a judicial/criminal proceeding — not to separate civil, administrative, or departmental actions arising from the same conduct. - Myth: Article 20(3) means police can never take a suspect's fingerprints, blood sample, or handwriting sample.
Fact: Courts have ruled that providing physical samples like fingerprints or handwriting is not 'being a witness against oneself' — the protection covers only testimonial compulsion, i.e., being forced to communicate personal knowledge or confessions.