K.S. Puttaswamy v. Union of India

The story

When Justice K.S. Puttaswamy, a retired judge, challenged the government's sprawling Aadhaar identification program, he set off a constitutional reckoning far bigger than one scheme. Old judgments from the 1950s and 60s had murkily suggested Indians had no fundamental right to privacy—rulings increasingly at odds with a digital age of biometric databases and mass surveillance. The Supreme Court, recognizing the stakes, assembled a rare nine-judge bench to resolve the question once and for all. Government lawyers argued privacy was too vague a concept to enshrine as a fundamental right and that welfare programs like Aadhaar needed unfettered access to data for efficiency. Petitioners countered that human dignity was meaningless without control over one's own body, choices, and information. In August 2017, the Court delivered a resounding, unanimous verdict: privacy is not a privilege but a fundamental right, woven into the fabric of life and liberty itself. The old precedents were swept aside. This human moment—an ex-judge's persistence forcing the highest court to confront modern surveillance realities—became a turning point. It paved the way for future battles over data protection, LGBTQ+ rights, and individual autonomy, forever reshaping how the Indian state must treat the private lives of its citizens.

The facts

Justice K.S. Puttaswamy (Retd.), a former judge of the Karnataka High Court, filed a writ petition challenging the constitutional validity of the Aadhaar biometric identification scheme on the ground that it violated citizens' right to privacy. Because two earlier decisions (M.P. Sharma, 1954, and Kharak Singh, 1962) had suggested that privacy was not a fundamental right under the Constitution, a five-judge bench referred the core question to a larger nine-judge bench to authoritatively settle the issue. The matter was heard independently of the Aadhaar case's merits, focusing solely on whether privacy enjoys constitutional protection.

The question before the court

Whether the right to privacy is a fundamental right guaranteed by the Constitution of India, and whether the earlier rulings in M.P. Sharma and Kharak Singh, which cast doubt on such a right, were correctly decided.

The holding

A nine-judge bench of the Supreme Court unanimously held that the right to privacy is a fundamental right protected under Article 21 of the Constitution as part of the right to life and personal liberty, and is also derived from the freedoms guaranteed under Part III more broadly. The Court overruled M.P. Sharma and Kharak Singh to the extent they held privacy was not a protected constitutional right. It clarified that privacy includes informational privacy, bodily autonomy, and decisional privacy, and that any state intrusion into privacy must satisfy a threefold test of legality, legitimate state aim, and proportionality.

The principle it stands for

Privacy is not a nebulous or borrowed concept but an intrinsic part of the right to life and personal liberty under Article 21, and also draws sustenance from other fundamental rights in Part III. State action infringing privacy must be backed by law, pursue a legitimate aim, and be proportionate to that aim. This case establishes privacy as a justiciable, enforceable fundamental right in Indian constitutional law.

Provisions this case shaped

• Art. 21Protection of life and personal libertyexpanded — Privacy read into 'life and personal liberty' under Article 21.
• Art. 14Equality before lawinterpreted — Privacy linked to equality guarantees as part of Part III rights.
• Art. 19Protection of certain rights regarding freedom of speech, etcinterpreted — Privacy connected to freedoms of expression and movement under Article 19.