Section 170 of BNSS : Section 170: Arrest to prevent commission of cognizable offences.

Explanation using Example

Example 1:

Ravi, a police officer in Mumbai, receives credible information from a reliable informant that a group of individuals is planning to rob a local bank the next day. Ravi knows that robbery is a cognizable offence, meaning it is a serious crime for which the police can arrest without a warrant. Given the urgency and the potential harm, Ravi decides to arrest the individuals involved in the plan to prevent the robbery from taking place. He does so without waiting for a Magistrate's order or obtaining a warrant, as he believes that the crime cannot be prevented otherwise. The individuals are taken into custody, and Ravi ensures that they are not detained for more than twenty-four hours unless further detention is authorized by law.

Example 2:

In Delhi, Officer Priya learns through surveillance that a known criminal, Rajesh, is planning to carry out an assault on a political figure during a public rally. Assault is a cognizable offence, and Priya understands the gravity of the situation. To prevent the assault and ensure public safety, Priya arrests Rajesh immediately without a warrant or Magistrate's order. Rajesh is detained, and Priya ensures that his detention does not exceed twenty-four hours unless further detention is legally justified under other provisions of the law.