TL;DR
The BNSS introduces two groundbreaking forensic evidence provisions: Section 176(3), which mandates forensic expert visits to crime scenes and videography of evidence collection for all offences punishable with 7 or more years; and Section 349, which expands Magistrates' power to order forensic sampling (fingerprints, voice samples, blood, DNA) from any person, including without prior arrest. These provisions aim to modernize India's evidence-gathering infrastructure and reduce reliance on confessions and witness testimony. Section 176(3) comes with a 5-year implementation window, allowing states to notify compliance dates by 2029. The provisions address India's chronically low conviction rate by mandating scientific evidence collection at the earliest stage of investigation.
Overview: The Old Position
CrPC Framework for Crime Scene Investigation
The CrPC, 1973, had minimal provisions for forensic investigation:
| CrPC Section | Provision | Limitation |
|---|---|---|
| Section 174 | Inquest by police for unnatural death | Limited to suicide, murder, accidental death, and specific circumstances |
| Section 175 | Power of police officer to require attendance | Could compel witnesses but not forensic experts |
| Section 293 | Reports of certain government scientific experts | Listed specific experts whose reports were admissible without court appearance |
| Section 311A | Power of Magistrate to order samples | Limited to finger impressions — did not cover voice, blood, DNA |
Key Limitation
The CrPC did not mandate:
- Forensic expert visits to crime scenes
- Videography of evidence collection
- Collection of forensic evidence as a mandatory step
- Sampling of voice, blood, DNA, or biological material (beyond fingerprints)
Crime scene investigation was left to police discretion. Many cases proceeded without any forensic evidence, relying entirely on eyewitness testimony and confessions — both of which are unreliable and frequently challenged.
Section 176(3) BNSS — Mandatory Forensic Investigation and Videography
Provision
Section 176(3) provides:
In case of an offence punishable with imprisonment for a term of seven years or more, the investigation officer shall cause forensic experts to visit the crime scene for collection of forensic evidence and shall cause videography of the process on mobile phone or any other electronic device.
Essential Elements
- Trigger: The offence must be punishable with imprisonment of 7 years or more
- Forensic expert visit: The investigation officer must arrange for a forensic expert to visit the crime scene — this is mandatory, not discretionary
- Evidence collection: The forensic expert must collect forensic evidence at the scene
- Videography: The entire process of forensic evidence collection must be recorded on video — mobile phone or any other electronic device
- Documentation: The videographic record becomes part of the case file
Offences Covered
Any offence punishable with 7+ years imprisonment, including:
| Offence Category | Examples | BNS Sections |
|---|---|---|
| Murder and culpable homicide | Murder, culpable homicide not amounting to murder | Sections 101, 103, 105 |
| Sexual offences | Rape, aggravated rape, gang rape | Sections 63-70 |
| Robbery and dacoity | Robbery, dacoity with murder | Sections 309, 310 |
| Kidnapping | Kidnapping for ransom, abduction | Sections 137-140 |
| Organised crime | Organised crime, petty organised crime | Sections 111, 112 |
| Drug offences | Under NDPS Act (where applicable) | Various |
| Dowry death | Section 86 BNS | Section 86 |
| Acid attacks | Section 124 BNS | Section 124 |
5-Year Implementation Window
Section 176(3) includes a critical implementation clause: states must notify the date for implementation within a period of 5 years from the commencement of the BNSS (i.e., by 1 July 2029).
This phased implementation reflects the reality that:
- Many states lack sufficient forensic laboratories and trained personnel
- Mobile forensic units need to be established
- Training programs for investigation officers and forensic teams are required
- Equipment procurement and laboratory upgradation takes time
Standard Operating Procedure (SOP)
The Bureau of Police Research and Development (BPRD) has issued a Standard Operating Procedure for audio-video recording of crime scenes, covering:
- Arrival documentation: Recording the date, time, and conditions upon arrival at the crime scene
- Scene preservation: Documenting the untouched state of the scene before evidence collection
- Evidence collection: Recording each step of forensic evidence collection — including sealing, labelling, and packaging
- Chain of custody: Documenting the transfer of evidence from scene to laboratory
- Storage and access: Maintaining videographic records with appropriate access controls
Section 349 BNSS — Expanded Forensic Sampling Powers
Provision
Section 349 expands the Magistrate's power to order collection of forensic samples from any person.
Comparison with CrPC Section 311A
| Feature | CrPC Section 311A | BNSS Section 349 |
|---|---|---|
| Samples covered | Finger impressions only | Finger impressions, voice samples, blood samples, DNA, handwriting, and other biological samples |
| Who can order | Magistrate | Magistrate |
| Prior arrest required | Generally needed — limited to accused | Not required — can be ordered for any person |
| Written order | Required | Required |
| Purpose | Investigation/proceeding | Investigation/proceeding |
Key Expansion
The expanded sampling powers represent a fundamental shift:
- Voice samples: Can now be ordered for comparison with audio evidence (phone recordings, CCTV audio, intercepted communications)
- Blood and DNA: Can be ordered for biological identification, paternity determination, and crime scene matching
- Without prior arrest: The Magistrate can order samples from any person upon written order — the person need not be arrested first. This is particularly significant for early-stage investigations where suspects have not yet been formally arrested.
Constitutional Safeguards
The power to compel bodily samples raises fundamental rights issues:
Right against self-incrimination (Article 20(3)): The Supreme Court in Selvi v. State of Karnataka (2010) distinguished between testimonial compulsion (protected) and physical evidence (not protected). Fingerprints, blood samples, and DNA fall in the latter category and are generally permissible.
Right to privacy and bodily integrity (Article 21): Any sampling order must satisfy the proportionality test — the investigative need must outweigh the privacy intrusion.
Magistrate's written order: The requirement for a Magistrate's written order provides judicial oversight, ensuring sampling is not ordered arbitrarily.
Forensic Report Timeline
Section 193 BNSS establishes a 90-day deadline for forensic reports:
The Director or in-charge of the forensic laboratory shall provide the forensic report to the investigating officer within ninety days of receiving the evidence.
This is entirely new — the CrPC had no timeline for forensic report delivery. Delays of years in receiving forensic reports were common, severely impacting trial timelines.
Implementation Challenges
Infrastructure Gap
India's forensic infrastructure faces significant challenges:
Laboratory shortage: India has approximately 7 Central Forensic Science Laboratories and about 30 State Forensic Science Laboratories for a population of 1.4 billion. This capacity is grossly inadequate for mandatory forensic investigation in all 7+ year offences.
Personnel shortage: Trained forensic experts — crime scene investigators, DNA analysts, digital forensics specialists — are in short supply.
Mobile forensic units: Many districts, particularly rural ones, lack mobile forensic units that can reach crime scenes promptly.
Equipment: Modern forensic equipment (DNA sequencers, gas chromatographs, mass spectrometers) is expensive and requires regular maintenance and calibration.
Evidentiary Consequences of Non-Compliance
A critical unanswered question: What happens if Section 176(3) is not complied with?
The BNSS does not specify whether failure to conduct forensic investigation or videography renders evidence inadmissible or the investigation defective. Courts will need to determine whether non-compliance:
- Makes the investigation void
- Creates an adverse inference against the prosecution
- Is a procedural irregularity that can be cured
- Vitiates the trial
Until this is judicially settled, defence counsel should raise non-compliance as a ground for challenging the prosecution case, particularly in serious offences where forensic evidence should have been determinative.
New Provisions with No Old Equivalent
| Section | Provision | Details |
|---|---|---|
| Section 176(3) | Mandatory forensic expert visit and videography | Forensic expert must visit crime scene and videograph evidence collection for 7+ year offences |
| Section 349 (voice, blood, DNA) | Expanded forensic sampling | Magistrate can order voice, blood, DNA, and other biological samples — even without prior arrest |
| Section 193 (90-day report) | Forensic report timeline | 90-day deadline for forensic laboratories to deliver reports |
Practical Checklist for Practitioners
- For any offence punishable with 7+ years, verify whether forensic experts visited the crime scene — if not, challenge the investigation's thoroughness
- Demand production of the videographic record of crime scene evidence collection — if videography was not conducted, argue non-compliance with Section 176(3)
- Check whether the state has notified the implementation date for Section 176(3) — the 5-year window means some states may not yet have activated this requirement
- For forensic sampling orders under Section 349, verify that the Magistrate issued a written order and that the sampling was proportionate to the investigation's needs
- Track the 90-day forensic report deadline under Section 193 — if the laboratory is delayed, seek court directions for expedited processing
- In cases where forensic evidence is critical (murder, rape, dacoity), the absence of forensic investigation can be used to argue reasonable doubt
- Preserve the original videographic record — challenge any evidence where the video chain of custody is broken
- For voice sample and DNA orders, verify compliance with constitutional safeguards — cite Selvi v. State of Karnataka on the distinction between testimonial and physical evidence
- Note that the forensic investigation and videography requirements apply prospectively from the date of state notification — they do not apply retrospectively to cases registered before notification
Recent judicial developments (post-July 2024)
The following cases from the Veritect Legal Intelligence database illustrate how courts are interpreting the new forensic evidence and investigation provisions under BNSS:
Sajimon Parayil v. State of Kerala (7 February 2025)
Court: Supreme Court of India | Bench: Vikram Nath, Sanjay Karol, Sandeep Mehta | Result: Petition dismissed
This case arose from the aftermath of the "Hema Committee" report on working conditions of women in the Malayalam cinema industry. The Kerala High Court directed a Special Investigating Team to obtain the full report and investigate alleged offences, invoking Section 176 BNSS. Petitioners (a film producer, a witness, and an actress) challenged the direction, arguing it violated privacy rights and amounted to coercion. The Supreme Court dismissed the petitions, holding that Section 176 BNSS imposes a non-discretionary duty on police to investigate upon receipt of information about cognizable offences. The Court ruled that courts cannot issue injunctions restraining police from acting under Section 176, and that the High Court's supervisory directions did not infringe privacy rights.
Significance: While this case addresses Section 176 BNSS in the context of the general duty to investigate (rather than the specific forensic videography mandate under Section 176(3)), it establishes the foundational principle that Section 176's obligations are non-discretionary. This reasoning strengthens the argument that the mandatory forensic investigation requirement under Section 176(3) cannot be treated as optional once a state notifies its implementation.
Veritect reference: Diary_48998-2024_Judgment
Moin Akhtar Qureshi v. Central Bureau of Investigation (24 December 2025)
Court: Delhi High Court | Judge: Neena Bansal Krishna | Result: Petition dismissed; voice sample order upheld
The petitioner challenged an order directing him to provide voice samples for comparison with intercepted phone recordings. The Court upheld the order, directly recognising Section 349 of BNSS 2023 as providing explicit statutory authority for Magistrates to order voice samples, blood samples, DNA, and other forensic material. The Court relied on Ritesh Sinha v. State of U.P. (2019), where the Supreme Court had used Article 142 to fill the legislative gap, and Rahul Agarwal v. State of West Bengal (2025), which held that this power extends to "any person" including witnesses. The Court held that voice samples are "material evidence" for comparison and not self-incriminatory under Article 20(3), and that the right to privacy must yield to legitimate state interests in criminal investigation.
Significance: Confirms that Section 349 BNSS has resolved the pre-existing legislative gap in forensic sampling powers. Courts are now treating the expanded sampling authority (voice, blood, DNA, biological material) as settled law on firm statutory footing, moving beyond the earlier reliance on inherent powers under Article 142.
Veritect reference: DLHC010350622021_1_2025-12-24
Emerging patterns
Based on available post-July 2024 court orders from the Veritect database:
- Section 176 BNSS treated as non-discretionary: The Supreme Court has affirmed that the investigation obligations under Section 176 are mandatory, not subject to judicial injunction. This reasoning will apply with equal force to the forensic investigation mandate under Section 176(3) once states notify implementation.
- Section 349 forensic sampling operational: Courts are actively recognising the expanded sampling powers under Section 349 BNSS. The legislative gap that previously required Supreme Court intervention under Article 142 has been filled.
- Constitutional safeguards preserved: While upholding mandatory forensic provisions, courts continue to apply proportionality tests and require Magistrate oversight, ensuring that expanded powers do not override fundamental rights.
Frequently Asked Questions
Is forensic investigation mandatory for all criminal cases?
No. Section 176(3) mandates forensic expert visits and videography only for offences punishable with imprisonment of 7 years or more. For lesser offences, forensic investigation remains discretionary.
When does this provision come into effect?
Section 176(3) comes with a 5-year implementation window. Each state government must notify the date for implementation within 5 years from 1 July 2024 (i.e., by 1 July 2029). Until a state notifies, the provision is not mandatory in that state.
Can DNA samples be taken without arresting the suspect?
Yes. Section 349 BNSS allows the Magistrate to order collection of blood, DNA, voice, and other biological samples from any person upon a written order. Prior arrest is not required. However, the order must be proportionate and judicially supervised.
What happens if police fail to videograph the crime scene?
The BNSS does not specify automatic consequences for non-compliance. However, defence counsel can argue that the absence of videography creates an adverse inference — particularly in serious cases where the prosecution's version of crime scene evidence is contested.
What is the deadline for forensic laboratories to deliver reports?
Section 193 BNSS establishes a 90-day deadline from the date the laboratory receives the forensic evidence. This is entirely new — the CrPC had no such timeline, and delays of years were common.