Section 151 CrPC: Preventive Arrest and Section 170 BNSS
The power to arrest a person to prevent a cognizable offence is a narrowly conditioned preventive measure. Section 151 of the Code of Criminal Procedure, 1973, has been replaced for the current procedural framework by Section 170 of the Bharatiya Nagarik Suraksha Sanhita, 2023.
Section 170 BNSS: Arrest to Prevent Commission of Cognizable Offences
Chapter XII of the BNSS concerns preventive action by the police. Section 170 authorises a police officer who knows of a design to commit a cognizable offence to arrest the person concerned without a warrant or prior Magistrate's order only if the officer considers that the offence cannot otherwise be prevented.
Section 170(1) - Preventive arrest
A police officer knowing of a design to commit any cognizable offence may arrest, without orders from a Magistrate and without a warrant, the person so designing, if it appears to such officer that the commission of the offence cannot be otherwise prevented.
Section 170(2) - Twenty-four-hour limit
No person arrested under sub-section (1) shall be detained in custody for a period exceeding twenty-four hours from the time of his arrest unless his further detention is required or authorised under any other provisions of this Sanhita or of any other law for the time being in force.
Official text: Bureau of Police Research and Development - BNSS (PDF); National Crime Records Bureau - BNSS chapters.
When Can the Police Make a Preventive Arrest?
The statutory requirements must be considered together:
- Knowledge of a design: The officer must know of a plan or intention to commit an offence, rather than rely on a vague or unsupported suspicion.
- Cognizable offence: The anticipated conduct must amount to a cognizable offence, for which the police have statutory authority to arrest without warrant.
- Necessity: The officer must consider that the anticipated offence cannot be prevented by less restrictive means.
- Preventive purpose: The power is directed at preventing an offence, not punishing a person for an unproved allegation.
Meaning of a cognizable offence
Under Section 2(1)(g) BNSS, a cognizable offence is an offence for which, and a cognizable case is a case in which, a police officer may arrest without warrant in accordance with the First Schedule or any other law in force. This classification does not itself dispense with the additional necessity requirement under Section 170.
How Long Can a Person Be Detained?
Section 170(2) imposes a maximum of 24 hours from the time of arrest for custody under that provision alone. Continued detention is not automatically permitted merely because police apprehend a breach of peace: it must be required or authorised by another applicable legal provision.
Article 22 of the Constitution protects arrested persons through safeguards concerning information about grounds of arrest, access to legal counsel, and production before a Magistrate within the constitutionally prescribed period, subject to the Constitution's stated exceptions. Relevant arrest and procedural protections under the BNSS also apply as appropriate.
A preventive arrest is not a conviction and does not, by itself, establish that the person has committed an offence.
Original Section 151 CrPC - Statutory Text
151. Arrest to prevent the commission of cognizable offences
(1) A police officer knowing of a design to commit any cognizable offence may arrest, without orders from a Magistrate and without a warrant, the person so designing, if it appears to such officer that the commission of the offence cannot be otherwise prevented.
(2) No person arrested under sub-section (1) shall be detained in custody for a period exceeding twenty-four hours from the time of his arrest unless his further detention is required or authorised under any other provisions of this Code or of any other law for the time being in force.
Section 151 CrPC and Section 170 BNSS: Key Points
| Issue | Legal position |
|---|---|
| Former law | Section 151, Code of Criminal Procedure, 1973 |
| Current corresponding law | Section 170, Bharatiya Nagarik Suraksha Sanhita, 2023 |
| Power | Preventive arrest without warrant or prior Magistrate's order, subject to statutory conditions |
| Purpose | To prevent an anticipated cognizable offence that cannot otherwise be prevented |
| Detention | Not more than 24 hours under this provision alone; further detention needs separate lawful authority |
What Can Be Done if Preventive Arrest Is Unlawful?
The appropriate remedy depends on the facts, the arrest record, and whether any other proceedings have been initiated. The arrested person or family may seek legal assistance, request details of the grounds and legal authority for custody, and approach the appropriate Magistrate. In a suitable case of unlawful detention, constitutional remedies including a petition for habeas corpus before the High Court may be available.
For official legislation and guidance, see the BPR&D new criminal laws resource and the Ministry of Home Affairs criminal laws portal.
Related Preventive Police Powers
Section 168 BNSS (formerly Section 149 CrPC) concerns the police duty to prevent cognizable offences. Section 169 BNSS (formerly Section 150 CrPC) concerns communication of information about a design to commit a cognizable offence. These provisions should be read alongside Section 170.
Frequently Asked Questions
What is Section 151 CrPC?
It authorised preventive arrest without a warrant where a police officer knew of a design to commit a cognizable offence and believed the offence could not otherwise be prevented.
What is the equivalent of Section 151 CrPC under BNSS?
Section 170 of the Bharatiya Nagarik Suraksha Sanhita, 2023, is the corresponding provision for preventive arrest.
Can police detain someone for more than 24 hours under Section 170 BNSS?
Not solely on the authority of Section 170. Continued detention beyond 24 hours requires authority under another applicable legal provision.
Is preventive arrest the same as conviction?
No. Preventive arrest aims to stop an anticipated cognizable offence and is not a finding of guilt.
This article provides general legal information. The applicable procedure may depend on the date of the proceedings and the facts of the case.