Preventive detention: When does apprehension become a legally valid ground to curb liberty?

Can the State detain a person for something they might do, rather than an offence they have allegedly committed? Preventive detention rests on precisely this premise. But the power to anticipate a threat does not give authorities an unrestricted licence to deprive people of their liberty.

The question has come into focus following the mass detentions during protests in Delhi against Chief Election Commissioner Gyanesh Kumar.

On October 11, the Supreme Court directed authorities to ensure that peaceful, unarmed people were not detained except in accordance with the procedure established by law. The intervention followed allegations of police excesses, restrictions on movement, and the detention of protesters, journalists and lawyers.

While the detentions during the protests should not automatically be equated with formal preventive detention under a special statute, the episode raises a larger question: how far can the State go in the name of preventing a possible disturbance, and what happens when the grounds for doing so do not stand up to legal scrutiny?

Preventive detention differs fundamentally from ordinary criminal proceedings. In a criminal case, the police investigate an alleged offence and the prosecution must establish guilt through a trial.

Preventive detention, by contrast, seeks to prevent anticipated conduct considered prejudicial to specified interests, including national security and public order. It can deprive a person of liberty without a criminal trial establishing guilt for the conduct feared.

Article 22 of the Constitution provides a framework for preventive detention, while laws such as the National Security Act, 1980, prescribe the circumstances in which the power can be exercised.

The Constitution also provides safeguards, including communication of the grounds of detention and an opportunity to make a representation against the order, subject to specified exceptions.

The challenge lies in determining what constitutes a sufficient ground for anticipating a threat. Authorities are not expected to wait for violence to occur before acting. However, an apprehension cannot be a substitute for relevant material supporting the decision to detain someone.

The distinction between law and order and public order is central to this determination. Every criminal offence or local disturbance does not necessarily threaten public order. An incident may affect an individual or a limited group without disrupting the life of the community at large.

Preventive detention becomes legally questionable when the authority fails to demonstrate how the alleged conduct threatens public order in the sense required by law.

The Supreme Court reiterated this principle in a judgment delivered on May 13, 2026, in Vidyawant v. State of Maharashtra. It quashed a detention order under the Maharashtra Prevention of Dangerous Activities Act, holding that repetitive, stereotyped allegations—without cogent material indicating a breach of public order—could not justify preventive detention.

The court also examined whether the alleged activities could be addressed under ordinary criminal law.

The ruling underscores a recurring weakness in detention orders: the use of broad, formulaic language without adequately establishing the connection between a person's conduct and the anticipated threat. Merely describing someone as a threat to public order does not establish that the statutory conditions for detention have been met.

Other grounds can also render a detention order vulnerable to challenge. These include reliance on stale incidents that have little connection with the present apprehension, failure to consider relevant material, non-application of mind by the detaining authority and procedural lapses that undermine the detainee's ability to challenge the decision.

Where the grounds are vague or the material relied upon does not support the apprehension, the legality of the order can be questioned.

There is also a distinction between preventive detention under a special statute and preventive action by police to avert an imminent offence.

The Bharatiya Nagarik Suraksha Sanhita provides police and magistrates with certain preventive powers, subject to statutory conditions. A person temporarily detained during a protest is not necessarily under a formal preventive detention order under the National Security Act.

The constitutional stakes are particularly high during demonstrations. Articles 19(1)(a) and 19(1)(b) protect freedom of speech and peaceful assembly, subject to constitutionally permissible restrictions.

The State is entitled to prevent violence and maintain public order, but the possibility of disruption cannot, by itself, extinguish these freedoms.

The Supreme Court's intervention in the Delhi protests reinforces the principle that restrictions on liberty must have a legal basis.

It does not mean that every preventive measure is unlawful, or that authorities must remain passive in the face of a genuine threat. It does mean that preventive action must be justified within the limits of the law.