Crime Scene Management: National and International Scenario

The Indian forensic-science system is a federation of bodies with overlapping but distinct mandates.

• DFSS at MHA, New Delhi. Policy coordination, budgetary control of the CFSLs, inter-state case allocation. DFSS sets the SOPs the CFSLs adopt and that the better state FSLs converge on. It also runs the National Forensic Data Centre projects.
• CFSLs (six). Hyderabad, Chandigarh, Kolkata, Pune, Bhopal, and Guwahati. Each has slightly different specialisations (Hyderabad is the de facto national lead on technology-led crime, Chandigarh on toxicology and questioned-documents, Kolkata on biology and serology, Pune on cyber, Bhopal on ballistics). They handle inter-state cases, federal-agency requests (NIA, CBI, NCB), and politically sensitive matters DFSS routes to them.
• State FSLs and their sub-units. Every state has one principal FSL, usually in the capital, plus regional FSLs in two to five major cities, and increasingly district-level sub-units. These handle the bulk of state-police casework. The volume is enormous and the staffing varies hugely between, say, Maharashtra (well-staffed, large) and a small north-eastern state FSL.
• Mobile units (Mobile CSI Vans). A fleet of equipped vans operated by state and central forces. The 2018-2024 modernisation push, accelerated by BNSS, pushed mobile-unit numbers significantly upward.
• NFSU (the university). Headquartered at Gandhinagar; satellite campuses at Delhi, Goa, Agartala (Tripura), and other locations under buildout across India. NFSU's role is training the next-generation MSc workforce, and running the technology pilots that filter into operational FSL practice.

The Bharatiya Nagarik Suraksha Sanhita 2023 commenced on 1 July 2024 and replaced the CrPC. Section 176(3) is the provision the bench, the bar and forensic textbooks have all paid attention to. It mandates that in any offence punishable with seven or more years' imprisonment, the investigating officer must cause a forensic expert to visit the scene of crime for the purpose of collecting forensic evidence and shall also videograph the process on a mobile phone or any other electronic device.

What changed, in operational terms:

• The forensic expert is now at the scene. Previously the IO collected the evidence and forwarded it to the FSL. Now an FSL team visits the scene itself for the 7+ year offence band, which covers most serious crime: homicide, rape, dowry death, dacoity, kidnapping, narcotics-large-quantity, and more.
• The videography requirement. Section 105 of BNSS makes videography of search and seizure mandatory for cognisable offences. Section 176(3) adds the FSL-visit videography. The two reinforce each other.
• State-by-state implementation has been uneven. Some states (Maharashtra, Tamil Nadu, Karnataka, Delhi) had the workforce and mobile units to absorb the change. Others have struggled, and the practical compliance rate in 2026 is below 100% even for the offence categories where the section applies.
• The chain of custody (covered in Chain of Custody) starts earlier. Custody begins at the FSL team's arrival at the scene, not when the packet reaches the FSL building. Defence counsel have been quick to test this.

The harder, less-textbook point. The seven-year threshold was chosen because it catches "serious" offences in the BNS scheme. The volume implication is enormous. A state like Uttar Pradesh, with a high homicide and serious-crime caseload, suddenly has thousands of additional mandatory FSL-visits per year. The FSL workforce and the mobile-unit fleet to actually do those visits has been expanding fast, but the gap between mandate and capacity is real in 2026 and will be for several more years.

The FBI's Evidence Response Team (ERT) programme is the international comparator most often cited in Indian forensic textbooks.

The structural picture:

• ERTs are federal, not local. Each of the 56 FBI field offices has at least one ERT. They serve FBI casework, not state or local cases (state and local police in the US use their own crime-scene units, with widely varying quality).
• The ERT manual is published and revised regularly. It's a written SOP covering scene approach, documentation, collection, packaging, transport and chain of custody. State FSLs in India have looked at this manual as a reference point for their own SOP development.
• The training pipeline is long. ERT members are typically FBI special agents or professional staff who go through several weeks of dedicated scene-training plus annual recertification. The cadre is small, well-trained, and tightly governed by the manual.
• The case-volume per ERT is low by Indian standards. The FBI handles a relatively small number of federal scenes per year. Each scene gets a thorough, manual-compliant work-up. Indian state FSLs run an order of magnitude more scenes per analyst per year.
• Federal coordination with state and local. When the FBI works alongside state or local police on a scene, jurisdiction and evidence handling are negotiated. The ERT's manual governs FBI work; state SOPs govern state work.

What Indian practice could and arguably should adopt: the written, revised, publicly available manual. State FSL SOPs in India are often internal documents that practitioners can't easily access. The CFSL/DFSS push toward published national SOPs (in progress) borrows from this model.

What Indian practice can't sensibly adopt: the small-cadre, low-volume, weeks-of-training-per-member model. Indian state FSLs operate at a volume where every district SOCO needs to be competent, not a small elite team. The training pipeline has to be NFSU-scale, not FBI-scale.

The other three internationally cited bodies serve distinct functions.

INTERPOL (Lyon, France). A coordination body for police across 196 member countries. INTERPOL itself does not run crime scenes. It issues notices, maintains databases (DNA, fingerprints, stolen art, travel documents), and supports member-country investigations. Its forensic role is database access and cross-border data sharing, not scene work. India is a long-standing member; the CBI is the National Central Bureau.

EUROPOL (The Hague, Netherlands). The European Union's law-enforcement agency. EUROPOL fuses intelligence across member states, supports joint investigations, and runs analysis projects on organised crime, terrorism and cybercrime. Like INTERPOL, EUROPOL doesn't run crime scenes; member-state national police handle scene work and feed data into EUROPOL's analytical workflow. The European Network of Forensic Science Institutes (ENFSI) is the more relevant body for forensic SOP coordination across Europe.

Scotland Yard, specifically the Metropolitan Police Specialist Crime Review Group (SCRG). This is operational scene-work at city level for London. The Met's scene-work is widely studied because it has produced detailed, accessible methodologies on cold-case reviews, BPA, and footwear evidence. Indian state FSL practice has borrowed from this work, particularly around cold-case methodology and the integration of forensic with intelligence work.

The relevant distinction is between international features that transfer across volume and context and those that do not.

Features that travel well to Indian context:

• Written, revised, publicly accessible SOPs. The FBI ERT manual is the cleanest model. DFSS is moving in this direction; state FSLs would benefit from joining the trajectory.
• Hash-based digital evidence integrity. SHA-256 hashing of digital files at capture is universal across well-run forensic systems. Indian practice is converging on this under BNSS section 105.
• Workforce certification pipelines. Some path to demonstrable competence (MSc-FNS at NFSU, IAI-equivalent specialty certifications) is non-optional. The pipeline scale has to fit Indian volume but the principle is shared.
• Federation-with-coordination. A federal-state-municipal structure with strong central coordination resembles the US model and has worked there. India already has this; the coordination piece (DFSS) is the area for development.

Features that don't travel well:

• Small-cadre, weeks-of-training-per-member ERT model. Indian volume forces broad competence rather than elite specialisation at the scene level.
• Federal-only operational role. US federal labs don't carry state caseload; Indian CFSLs effectively do, on inter-state and high-profile work, alongside DFSS coordination.
• Forensic-as-discretion at scene. The BNSS 176(3) mandatory-visit rule departs from the FBI's discretionary deployment model. The Indian rule is right for Indian conditions even if it doesn't match the US one.
• EUROPOL-style intelligence fusion. Useful as an aspiration, but it presupposes a level of cross-state data sharing that India's federal structure has not yet built.

This is where reading Tele-Forensics and Technology Innovation alongside this topic pays off. Tele-forensics is one of the ways Indian practice is closing the expert-turnaround gap to FBI-style same-day deployment without needing FBI-scale per-scene staffing. The remote-expert model fits Indian volume in a way the on-site-elite-team model wouldn't.

The "international best practice" framing produces two recurring errors in Indian forensic discussions.

The first error is volume blindness. An FBI ERT works perhaps a few dozen scenes per year per team. An Indian state FSL CSI team might work hundreds. Recommending "more training per scene-worker" without recognising the volume difference produces a recommendation that's mathematically impossible to implement. The right reform is one that scales with volume: better SOPs, better tooling, better tele-forensics support, all of which act as a force-multiplier across many scenes per worker.

The second error is statutory transplant. The BNSS 176(3) mandatory FSL visit is sometimes criticised as too strict on the ground that no US or UK statute imposes anything similar. That criticism misses the point. Indian FSL access at the scene was so spotty pre-BNSS that a permissive regime had produced systematic gaps; a mandatory regime is the corrective. The US and UK already have strong scene-attendance practices through other mechanisms (departmental SOPs, professional certification expectations) and don't need a statutory mandate. The Indian statute is solving an Indian problem.

The correct position is not "adopt FBI practices" but "adopt the parts that survive Indian volume and re-engineer the rest."