Investigation / Investigatio /

Investigation: The Police Process of Evidence Collection

Criminal investigation is the process by which the police gather evidence about an alleged offence — visiting the scene, recording witness statements, collecting forensic evidence, examining the accused and victim, and conducting searches. The BNSS framework governs investigation powers extensively, balancing effective law enforcement with the accused's fundamental rights, particularly Articles 20 and 21 of the Constitution.

Trigger: FIR for Cognisable Offences

For cognisable offences, investigation begins the moment the FIR is registered. Under BNSS Section 173, the officer-in-charge of the police station must register the FIR if the information discloses a cognisable offence — there is no discretion to refuse. The Supreme Court in Lalita Kumari v. Government of UP (2014) 2 SCC 1 (Constitution Bench) held that registration of FIR is mandatory for cognisable offences — the officer cannot conduct a preliminary inquiry before registration, except in sexual assault and matrimonial cases where the BNSS 2023 now permits it (Section 173).

Key Powers During Investigation

• Examination of witnesses (BNSS Section 180): Any person acquainted with the facts must answer questions — but not answer questions that may tend to incriminate them (Article 20(3) protection).
• Search and Seizure (BNSS Sections 185-190): Police may search premises with or without warrant, subject to conditions. Seized articles must be listed and a copy given to the owner.
• Arrest (BNSS Sections 35-54): Police may arrest without warrant for cognisable offences. An arrested person must be produced before a Magistrate within 24 hours (Article 22(2), Constitution).
• Forensic Examination (BNSS Section 183): Medical examination of the accused and victim (especially in sexual offences) is authorised, to be conducted by registered medical practitioners.

Judicial Oversight: CBI Investigations

The Supreme Court has held that it has the inherent power (Article 142) to transfer investigation to the CBI in cases involving police bias or conflict of interest. In Vineet Narain v. Union of India (1998) 1 SCC 226 (Hawala case), the Court monitored CBI investigation directly, establishing judicial oversight as a constitutional tool when executive integrity in investigation is compromised.

Time Limit and Default Bail

Investigation must be completed and the charge sheet filed within 60 or 90 days (BNSS Section 187), failing which the accused becomes entitled to default bail. This time limit is a powerful incentive for expeditious investigation and a protection against prolonged pre-trial detention.

“Investigation is the police's domain; the court does not sit in appeal over the investigating officer's choices during investigation. But the court jealously guards the accused's rights throughout.”