BNSS 2023: Investigation, FIR, Search and Seizure

BNSS keeps the broad architecture of CrPC (FIR, investigation, arrest, charge sheet, trial, appeal) but reorders the work in three directions: time-bound, digital-first, and victim-centric. Each shift has direct consequences for forensic practice.

The renumbering matters more than it looks. From mid-2024 onwards, official forms, charge sheets and Supreme Court orders cite BNSS section numbers; the CrPC citation is now read as outdated. The safe drafting habit is to lead with the BNSS number and add the old CrPC number in brackets only when both genuinely apply.

Section 173 BNSS is the FIR section. It restates the CrPC Section 154 framework with three additions that change forensic timelines.

1. Information received
   Complainant approaches the station, calls Dial 112, or files electronically. Time-stamp begins here.
2. Recording mode chosen
   Walk-in is signed on the spot. Zero-FIR is recorded even when the station has no territorial jurisdiction and forwarded. e-FIR is recorded electronically with a 3-day window for the complainant's signature.
3. FIR number assigned
   The number, year, and station code are entered into CCTNS (Crime and Criminal Tracking Network and Systems). The FIR copy is issued free of cost to the complainant.
4. Investigation triggered
   The Station House Officer (SHO) endorses the FIR to the investigating officer (IO). Section 176 procedure begins, including the Section 176(3) mandatory FSL call for 7+ year offences.

Before BNSS, "zero-FIR" was an administrative practice with patchy compliance and no statutory backing. Section 173 puts it inside the code. A complainant who reaches the nearest police station, regardless of jurisdiction, can demand registration; the FIR is numbered with a "0" prefix and forwarded to the station that does have jurisdiction. For forensic purposes, the practical effect is that the scene-to-station clock starts at the zero-FIR station's time-stamp, not at the receiving station's later registration. SOCO teams now check the zero-FIR endorsement when reconstructing how much time elapsed before the scene was secured.

An e-FIR carries a server-side timestamp that is harder to dispute than a handwritten clock entry. Defence counsel are starting to demand the e-FIR audit log to cross-check against the IO's case diary and the scene-arrival times in the SOCO's notebook. If the audit log and the case diary disagree, both lose weight, in the same way a chain-of-custody mismatch loses weight (covered in Chain of Custody).

One often-missed distinction: an FIR is not the same as a Daily Diary (DD) entry. A non-cognisable matter is a DD entry; only a cognisable offence triggers an FIR. The forensic relevance is that a DD entry does not start the Section 176(3) clock and does not require FSL presence at the scene, even where the underlying facts later look like a serious offence. Misclassification at the FIR stage is a recurring defence pressure point at trial.

Section 176(3) is the heart of BNSS for a forensic-science student. The text obliges the IO to call a forensic expert from the State FSL or RFSL to the scene of every offence punishable with imprisonment of 7 years or more. The expert is required to collect evidence and to record findings, with audio-video documentation, "wherever applicable". The provision is the statutory translation of what Indian forensic-policy committees had been recommending for two decades.

The practical workflow at a 7+ year scene in 2026:

• IO registers the FIR and notes the BNS section under which the case is being investigated.
• IO calls the SFSL / RFSL through the state's mobile-SOCO dispatch number. Most states have moved to a 24x7 desk that logs the call and dispatches a team.
• SOCO team reaches the scene, takes over the inner cordon, and assumes custody of physical evidence from arrival. This is the chain-of-custody handoff covered in detail at Securing and Documenting the Crime Scene.
• Video recording is started before the inner cordon is breached. Section 105 BNSS requires the recording; the SOCO's body camera or a dedicated camcorder is the usual instrument.
• Evidence is collected, packaged, and sealed in the SOCO's presence, with the seal impression captured on video as it is being made.
• The SOCO signs the seizure memo alongside the IO and panch witnesses. The presence of the SOCO signature is what distinguishes a BNSS-compliant seizure memo from a pre-BNSS one.

State implementation has lagged the statute. Maharashtra, Tamil Nadu, Delhi, Karnataka and Gujarat were broadly compliant by end of 2024. UP, Bihar, MP and the smaller states are still building out 24x7 SOCO desks; in those states, the rural IO often arrives at the scene before the SOCO and the chain-of-custody clock runs against the prosecution. Defence counsel has started to attack the FSL delay where the dispatch log shows a multi-hour gap, and at least one Allahabad High Court order in 2025 has read Section 176(3) strictly enough to question the admissibility of evidence that was collected before SOCO arrival.

Stated cleanly: Section 176(3) makes FSL team presence at the scene mandatory for offences punishable with 7+ years' imprisonment, effective 1 July 2024, with the SOCO required to collect evidence and record findings. The provision changes the chain-of-custody start time from the IO's later forwarding to the SOCO's arrival on scene. The mapping from FIR to charge sheet to court relies on the institutional structure laid out in Indian Forensic Laboratories: CFSL, SFSL, RFSL, and the substantive offences that trigger the 7-year threshold are catalogued in Bharatiya Nyaya Sanhita for Forensic Students.

Section 105 BNSS makes audio-video recording of search and seizure operations mandatory. The text applies to all searches and seizures under the code, not only to 7+ year offences. The recording is forwarded to the magistrate without delay and forms part of the case file. The provision works alongside Sections 185 to 187, which carry forward the substantive search-and-seizure regime from the CrPC with renumbering and minor edits.

The videography provision is the one with the most courtroom traction. The recording produces a continuous, time-stamped audiovisual record that the trial court can compare against the seizure memo. Three failure modes have already shown up in early appellate practice:

• Recording missing. The IO says the camera failed or the recording was lost. Defence treats the seizure as unrecorded and demands exclusion. Courts have not yet been uniformly strict, but the trend is clearly toward exclusion or adverse inference.
• Recording incomplete. Only the seizure moment is recorded; the surrounding context (entry into the premises, presence of panch witnesses, sealing of the packet) is missing. The defence argues that the recorded segment is curated and unreliable. The Section 105 mandate is read as covering the whole operation.
• Recording inconsistent with the memo. The video shows three items being seized; the memo lists four. The video shows the seal being applied at 4:35 pm; the memo says 4:10 pm. Any divergence undermines both documents.

Together, the Section 105 video and the Section 173 e-FIR audit log produce a time-stamped, difficult-to-alter record that makes the IO's case narrative verifiable against independent documentation in a way the pre-BNSS paper trail did not. A Section 105 recording that is absent, incomplete, or inconsistent with the seizure memo will be scrutinised on cross-examination.

The medical examination sub-provisions belong alongside search and seizure in any working summary. Section 51 BNSS deals with medical examination of an arrested person at the IO's request; Section 53 deals with medical examination of any person where a reasonable belief exists that examination will provide evidence; Section 53A is the special provision for medical examination of a person accused of rape, including DNA sampling. The DNA sampling provision is the one that most directly connects to the FSL workflow, and the consent and recording requirements are routinely scrutinised at trial.

Section 193 BNSS is the police report at the close of investigation, the renumbered successor to CrPC Section 173. The IO files it within 60 days (for offences punishable with less than 10 years' imprisonment) or 90 days (for offences punishable with 10+ years, including life and death) of the arrest, with extension only on a magistrate's order. The forensic report is annexed to the charge sheet, not filed separately, and a charge sheet without the relied-upon forensic report is incomplete.

1. FSL receives the packet
   Forwarding memo and sealed packet are checked at intake; seal-impression mismatch triggers rejection. Intake clerk initials the memo at the seal box.
2. Analysis assigned
   Section head allocates to an analyst; the analyst signs the worksheet from receipt. Worksheet is the contemporaneous record courts care about.
3. Report drafted
   Report follows the state FSL template: facts, methods, observations, opinion. The opinion is the only part the trial court usually reads in full.
4. Report signed and dispatched
   Senior analyst countersigns; the report is dispatched to the IO with a covering letter. Dispatch is logged in the FSL despatch register.
5. Annexed to charge sheet
   The IO annexes the FSL report (and the Section 105 video, where applicable) to the Section 193 charge sheet. Missing annexures are an early defence pressure point.

The 60/90 day window is the operational constraint that shapes FSL priorities. State FSLs work with a backlog that is measured in months for routine work and in years for specialist work like DNA in non-priority cases. The BNSS regime forces a triage decision: cases in the 60/90 day window must be turned around in time, and cases outside it slide further. The 2024 to 2026 transition has produced a measurable shift in FSL workflow toward charge-sheet-deadline-driven scheduling, with at least some unintended effects on quality and on the older case backlog.

A forensic officer who is called to give evidence under Section 193 must be ready for three things at a minimum: the worksheet behind the report (not just the report itself), the chain-of-custody documents the report depends on, and the methods and instruments used, including their last calibration date. The expert witness regime under the Bharatiya Sakshya Adhiniyam, especially Section 39 BSA, governs how that evidence is then received in court. The procedural side ends at the charge sheet; the evidentiary side begins after the cognisance.

The witness-protection sub-provisions deserve a brief mention. Sections 215 to 219 BNSS govern examination of witnesses by the police and lay down the framework for witness-protection schemes. Most state-level witness-protection rules now derive from these sections and from the Supreme Court's Mahender Chawla v Union of India direction. The forensic witness is, in principle, covered by these protections, although in practice the protection regime is invoked far more often for percipient witnesses than for technical ones.