Why Forensic Evidence Still Gets Rejected in Indian Courts — And What Needs to Change
India’s conviction crisis is not a shortage of crime scene evidence. It is a systemic failure to collect, preserve, certify, and present that evidence in the way courts demand. Here is a rigorous breakdown of why — and what forensic professionals must do differently.
There is a question every forensic science student in India must sit with at some point in their career: What happens to evidence once it leaves my hands? Does it reach the courtroom intact? Is it accepted? Does it actually secure a conviction?
The uncomfortable answer, backed by decades of data and a mountain of judicial decisions, is: far too often, it does not.
India’s criminal justice system has a forensic evidence problem — not a problem of quantity, but of admissibility. Crime scenes are visited. Samples are collected. Lab reports are produced. And then, at trial, evidence that took months to analyse is rejected by courts on procedural, technical, or documentation grounds. Justice is denied — not because the science failed, but because the system around the science failed.
These numbers should alarm every forensic professional. A conviction rate of 48% when forensic evidence is successfully admitted sounds like a failure — but it is actually an improvement over cases where evidence is rejected outright or never reaches its full evidentiary potential. The systemic gaps that cause forensic evidence to be excluded, discredited, or ignored are not mysteries. They are well-documented, recurring, and — critically — preventable.
“The rate of conviction is 48% if a case is decided on forensic evidence admitted and relied upon by the court. Loopholes in admissibility — from collection failures to lab backlogs — continue to undermine outcomes.”
— Research Gate, Impact of Forensic Evidence on Outcome of Criminal Trials (2025)📈 The Bigger Picture: India’s Conviction Rate Crisis
India’s overall court conviction rate has averaged around 42.5% from 2000 to 2022, with a modest uptick to 54.2% in 2022. Those numbers mask enormous disparity: Delhi’s advanced forensic labs and fast-track courts contribute to an 89% rate in some categories, while other states struggle to cross 30%. In rape cases, the conviction rate stood at just 28.6% per NCRB 2021 data — a statistic made more troubling given that forensic evidence (DNA, serology, trace evidence) is directly available in most such cases.
As of August 2024, 58.4 million cases were pending across Indian courts — approximately 80% of them criminal. Each district court judge carries an average load of 2,200 cases. Into this overburdened system, every incomplete, improperly certified, or procedurally challenged forensic report adds another adjournment, another year lost, another injustice compounded.
The causes are identifiable. Let us go through each of them with the precision they deserve.
⚠ The Top 5 Reasons Forensic Evidence Gets Rejected in Indian Courts
Of all the reasons forensic evidence gets thrown out of Indian courts, chain of custody failures are the most devastating — and the most avoidable. The chain of custody is not merely a paperwork formality. It is the legal narrative of evidence: who collected it, when, under what conditions, who transported it, who stored it, who tested it, and who brought it to court. If any single link in that chain is missing, misdocumented, or disputed, a court has the authority — and often the obligation — to reject the evidence entirely.
Indian courts have applied this standard consistently. In the landmark Maharashtra v. Pramod Kumar (2024) case, DNA evidence was rejected specifically due to chain of custody failures — despite the scientific validity of the analysis itself. The Supreme Court has repeatedly held that forensic findings must be accompanied by complete custody documentation from the moment of seizure to the moment of courtroom presentation.
The problem in India runs deep: improper crime scene management, documentation errors, equipment shortages, and wildly inconsistent procedures across states all contribute to chain of custody breakdowns. There is currently no standardised national framework for chain of custody documentation — a gap that results in inconsistencies in judicial assessment of admissibility.
The electronic evidence dimension makes this even more complex. Digital data can be altered, deleted, or corrupted without visible signs. Creating an unalterable chain of custody for electronic evidence demands documentation of every individual who accessed the data, every device used, and every transfer or copy operation — a standard that is aspirational rather than routine in most Indian investigations.
Contamination is the silent killer of forensic evidence. It often occurs before a trained forensic professional even arrives at the scene — in the critical first hours when police officers, paramedics, curious bystanders, and even relatives of victims move through a crime scene without protective equipment, proper training, or awareness of the havoc they are causing.
A contaminated DNA sample does not announce itself. A fingerprint overlaid by another’s touch, a biological stain degraded by humidity or chemical exposure, a trace fibre moved from its original deposit site — none of these failures are immediately obvious. They surface in the laboratory, and the damage is already irreversible. Courts then face expert testimony admitting uncertainty about the integrity of the sample, and the evidence’s probative value collapses.
India’s forensic science system suffers from a documented shortage of Scene of Crime Officers (SOCOs), uneven training standards across states, and a reliance on first-responders who have not been equipped with evidence preservation protocols. Only some states — Karnataka being a noted example — have developed dedicated SOCO frameworks. Most crime scenes are managed by police officers who may be highly experienced at traditional investigation but have received minimal training in forensic evidence protection.
The judicial consequence is unambiguous: courts assess whether forensic techniques are scientifically sound, reproducible, and accepted within the forensic science community. They examine error rates, methodology validation, and quality control. When contamination is admitted or suspected, that scrutiny becomes fatal to admissibility.
India’s forensic science laboratories are in crisis. The India Justice Report 2025 confirmed that 50% of sanctioned posts in forensic labs are lying vacant. Without contractual staff, the proportion of filled scientific posts at Forensic Science Laboratories (FSLs) dropped from 63% to just 52.5%. The labs that do operate are running at four to five times their actual workload capacity in DNA, toxicology, and cyber forensics divisions.
The consequences are direct and measurable. When the prosecution cannot produce a forensic report in time to oppose bail or file a complete chargesheet within the statutory period — 60 days for most offences, 90 days for serious crimes — courts may be compelled to grant “default bail.” Genuinely dangerous individuals accused of murder, rape, or organised crime can walk free simply because the FSL could not process evidence in time.
The backlog problem is made more acute by the Bharatiya Nagarik Suraksha Sanhita (BNSS), which came into force on July 1, 2024. Section 176(3) now mandates that for every offence punishable with seven years or more, a forensic expert must visit the crime scene and collect evidence — and the process must be videographed. While this is the right direction, it dramatically increases inflow volume at already-strained laboratories.
Haryana’s FSL has demonstrated what is possible with investment and political will: a 49% increase in monthly case disposal rates after equipment procurement, staff expansion, and mobile forensic van deployment. But Haryana’s progress is the exception. Nationally, the MHA issued a strict 3-month directive in April 2026 ordering all states to expand labs to district level, clear backlogs, and deploy mobile forensic vans.
A forensic report sitting on a judge’s desk is not evidence in the legal sense — it is a document that must be explained, defended, and contextualised by a qualified expert under oath. When that expert is absent, unavailable, or inadequately prepared for cross-examination, even the most scientifically rigorous report loses its force.
The Supreme Court of India has been consistent on this point: in State of H.P. v. Jai Lal and Others, the Court underscored that experts function as aides to judges, and their credibility — not merely their conclusions — determines evidentiary weight. In a subsequent case (6 SCC 728), expert testimony from a non-accredited lab was outright rejected. In Sunil Dattatraya Vaskar v. State of Maharashtra (2019), forensic evidence was deemed insufficient because the medical report alone did not establish the offence.
India faces a severe shortage of trained forensic expert witnesses who can communicate scientific findings in legal language, withstand adversarial cross-examination, and maintain credibility under courtroom pressure. Many forensic professionals are exceptional scientists but receive no formal training in expert witness communication. The gap between laboratory excellence and courtroom effectiveness is one of the most consequential — and least addressed — problems in Indian forensic practice.
Additionally, limited scientific literacy among judges and legal practitioners compounds the problem. When a judge cannot evaluate the scientific merit of expert testimony, decisions default to procedural grounds — and procedural challenges are exactly what defence lawyers are trained to exploit.
Documentation is where forensic science and legal procedure intersect — and where their collision is most often catastrophic. Evidence in Indian law is broadly presented in expert reports that function as documentary evidence. Those documents must be complete, certified, accurately referenced, and accompanied by all the procedural records that establish their provenance.
The failure modes here are numerous: missing seizure memos, incomplete sealing records, lab reports without method disclosures, unsigned certifications, reports filed by analysts who are not called to testify, and — increasingly critical in the digital age — electronic records without the mandatory Section 63/65B certificate.
The Supreme Court confirmed in Anvar P.V. v. P.K. Basheer (2014) that a written and signed certificate under the relevant provision of evidence law is mandatory for electronic evidence — oral testimony cannot substitute for it. The court in Arjun Panditrao Khotkar v. Kailash Kushanrao Gorantyal further clarified that the certificate must be present at the stage of formal admissibility.
Documentation failures are particularly insidious because they are often discovered at trial — months or years after the moment of collection — when they cannot be remedied without the evidence being challenged or excluded.
⚖ What the New Law Does: BSA 2023 & Electronic Evidence
India’s three new criminal laws — the Bharatiya Nyaya Sanhita (BNS), the Bharatiya Nagarik Suraksha Sanhita (BNSS), and the Bharatiya Sakshya Adhiniyam (BSA) — came into force on July 1, 2024, replacing the IPC, CrPC, and Indian Evidence Act respectively. For forensic professionals, the BSA contains the most consequential reforms in the area of evidence admissibility.
📄 Key BSA 2023 Reforms: Electronic & Forensic Evidence
Section 63 of the Bharatiya Sakshya Adhiniyam replaces Section 65B of the Indian Evidence Act and introduces critical new safeguards for electronic evidence admissibility.
- Section 61: No electronic or digital record shall be denied admissibility solely because it is in electronic or digital form — records carry the same legal effect as paper documents, subject to Section 63 conditions.
- Section 62: Contents of electronic records may be proved in accordance with the provisions of Section 63.
- Section 63 (Core): Electronic information printed, stored, or copied on computers, optical or magnetic media, semiconductor memories, or any communication device is admissible as a document, provided prescribed conditions are met.
- Dual Certificate Requirement: The certificate under Section 63(4) now has two parts — Part A (filled by the party producing the electronic record) and Part B (filled by a qualified expert). This dual-signature model adds a layer of accountability absent from the old 65B regime.
- Expert Certification: The addition of the phrase “and an expert” to the admissibility conditions formally embeds expert involvement in electronic evidence authentication.
- Expanded Scope: Section 63 extends to semiconductor memories and “any communication device,” significantly widening the scope beyond what the IEA 65B covered.
- BNSS Section 176(3): Mandates forensic expert crime scene visits and evidence collection — with video documentation — for all offences carrying 7+ year sentences.
The BSA framework is a meaningful step forward. But forensic professionals must understand that the law’s aspirations and ground-level realities remain separated by a significant implementation gap. The dual-certificate model increases the compliance burden — particularly in cases involving large-scale digital forensics. Part B certification by a qualified expert requires the existence of qualified experts in sufficient numbers, which the current vacancy crisis makes difficult to guarantee.
The evolution of judicial interpretation — from State (NCT of Delhi) v. Navjot Sandhu (which treated 65B as optional) to Anvar P.V. v. P.K. Basheer (which made it mandatory) to Arjun Panditrao Khotkar (which clarified timing) — shows that law governing electronic evidence in India has been shaped by judicial correction rather than clear legislative design. The BSA 2023 attempts to consolidate that evolution, but practitioners must remain current on how courts continue to interpret and apply these provisions.
✍ What Forensic Professionals Must Do Differently
Laws change. Court interpretations evolve. But the forensic professional on the ground is the first and most important line of defence against evidentiary failure. The following is not a theoretical wish list — it is a practical standard of professional conduct that every individual working in Indian forensic science should internalise and apply.
✅ Professional Action Checklist: Strengthening Evidence Admissibility
- Document everything at the scene. Names, badge numbers, timestamps, photograph labels, GPS coordinates, environmental conditions. A chain of custody begins the moment you arrive — before you touch anything.
- Seal, label, and sign every exhibit immediately. Do not allow samples to leave the scene without tamper-evident packaging and a completed seizure record signed by all relevant officers.
- Video-document the crime scene walk-through. BNSS Section 176(3) mandates this for serious offences. Treat it as mandatory practice for all cases — courts will increasingly expect it.
- Maintain electronic evidence hash values. Every digital file must be hash-verified at the point of collection and again at the point of examination. Document both. A changed hash is a broken chain.
- File Part A and Part B certificates under Section 63 BSA proactively. Do not wait for cross-examination to surface certification gaps. Work with the investigating officer and prosecutor to ensure certification is complete before the charge sheet stage.
- Be available and prepared to testify. Your report without your testimony is legally fragile. Train in courtroom communication. Practise explaining technical findings to a layperson. Anticipate cross-examination angles on methodology, error rates, and accreditation status.
- Know your lab’s accreditation status. Testimony from a non-accredited lab has been rejected by the Supreme Court. Accreditation is not a bureaucratic formality — it is a prerequisite to evidentiary credibility.
- Ensure timely report submission. A technically perfect report submitted after the chargesheet deadline is worse than a mediocre report submitted on time. Communicate proactively with investigators about turnaround timelines.
- Document methodology and scientific basis in your report. Courts assess scientific validity by examining error rates, validation studies, and quality control measures. Your report should make that case without requiring extensive oral elaboration.
- Stay current on BSA 2023 case law. The judicial interpretation of Section 63 is still developing. Follow decisions from High Courts and the Supreme Court. What sufficed procedurally in 2023 may not suffice in 2026.
🛠 The Systemic Reforms That Must Follow
Individual professional excellence is necessary but not sufficient. The systemic failures that cause forensic evidence rejection demand systemic solutions. Several are already in motion:
🏛 Lab Infrastructure Expansion
The government has approved eight new Central Forensic Science Laboratories across eight states, allocated ₹1,471 crore in forensic funding in Union Budget 2026-27 — the highest ever — and committed to a ₹2,254 crore National Forensic Infrastructure Enhancement Scheme running from 2024 to 2029. Four hundred and thirty-three mobile forensic vans have been sanctioned across 23 states and UTs. These are meaningful investments. Their impact depends entirely on execution.
🏫 National Forensic University (NFSU) Pipeline
Home Minister Amit Shah’s commitment of 33,000 forensic science experts and scientists per year — through NFSU’s expanding campus network (14 new campuses approved as of March 2026) — addresses the structural staffing deficit. But training volume must be matched by quality: professionals who can operate at the intersection of science and law, not merely in the laboratory.
⚖ A Reliability Standard for Expert Evidence
India urgently needs a judicial reliability standard for expert evidence — analogous to the Daubert standard in US courts — that allows both robust forensic evidence to be admitted and pseudoscientific techniques to be scrutinised and excluded. The current absence of such a standard means that fingerprint evidence (with documented false positive rates of up to 28.1%) receives the same presumption of reliability as validated DNA profiling. That inconsistency serves neither science nor justice.
🤝 Prosecutorial–Forensic Coordination
Prosecutors must be trained to understand forensic evidence well enough to anticipate and counter admissibility challenges. Currently, the adversarial system too often produces outcomes where technically valid evidence is excluded on procedural grounds because the prosecution was unequipped to respond. The MHA’s training of 32,524 investigating officers, prosecutors, and medical officers in forensic evidence handling is a step in the right direction.
“Training of personnel, enhancing forensic laboratories, suitably amending laws, and proper handling of forensic evidence will increase the current scenario and maximise the conviction rate.”
— ResearchGate: Impact of Forensic Evidence on Outcome of Criminal Trials (October 2025)⚖ The Verdict
Forensic evidence rejection in Indian courts is not a failure of science. It is a failure of systems, processes, institutional capacity, and professional preparation. The law — now updated through the BSA 2023 and BNSS 2024 — provides a better framework than India has ever had. The infrastructure investments announced since 2024 represent a genuine, historically significant commitment to closing the capacity gap.
But laws and investments are latent. They become real only through the professionals who implement them: the crime scene examiner who documents everything before touching anything; the laboratory analyst who files certifications proactively rather than reactively; the expert witness who walks into a courtroom as prepared for cross-examination as for the microscope.
As forensic scientists and aspiring forensic professionals in India, we sit at the most consequential moment in the history of our field. The legislative reforms are done. The infrastructure is being built. The remaining variable is professional excellence — and that is entirely within our control.
The courtroom does not care how sophisticated your analysis was. It cares whether every step from crime scene to testimony was documented, certified, and defensible. Meet that standard. Every time. Without exception.
📚 Sources & References
- ResearchGate — “Impact of Forensic Evidence on Outcome of Criminal Trials” (October 2025) · researchgate.net
- CEIC Data — India Court Conviction Rate (2000–2022) · ceicdata.com
- NextIAS Editorial — “India’s Criminal Justice System: Key Concerns & Road Ahead” (July 2025) · nextias.com
- Journal of Forensic Science and Medicine — “A Retrospective Analytical Study of Forensic Evidence in Rape and Murder Cases” (2023) · journals.lww.com
- IJCRT — “Jurisprudence of Forensic Science in India” (April 2025) · ijcrt.org
- Budding Forensic Expert — “The Backlog Crisis: India’s Forensic Labs Are Drowning” (April 2026) · buddingforensicexpert.in
- IIRCJ — “Evidence Mishandling and Chain of Custody Failures in India” (2024) · iircj.org
- Free Law — “Forensic and Electronic Evidence 2025: Chain of Custody, DNA, and Admissibility” · freelaw.in
- IJLMH — “Evidentiary Value and Admissibility of Forensic Evidence” · ijlmh.com
- SCC Online — “Securing the Links: A Framework for Chain of Custody in Indian Courts” (November 2024) · scconline.com
- LiveLaw — “Understanding E-Evidence Under Bhartiya Sakshya Adhiniyam 2023” · livelaw.in
- Drishti Judiciary — “Electronic Evidence under Bhartiya Sakshya Adhiniyam, 2023” · drishtijudiciary.com
- Bhatt & Joshi Associates — “Electronic Evidence Under BSA 2023: Section 63 Certificate Requirements” · bhattandjoshiassociates.com
- IndiaSpend — “Large Vacancies, Underutilised Budgets In India’s Forensic Science System” (August 2023) · indiaspend.com
- Budding Forensic Expert — “MHA’s Strict Directive on Forensic Reform” (April 2026) · buddingforensicexpert.in
- Budding Forensic Expert — “Forensic Science in India vs. Developed Countries” (March 2026) · buddingforensicexpert.in
- Mondaq — “The Role and Admissibility of Forensic Evidence in the Indian Criminal Justice System” (May 2024) · mondaq.com
- India Data Map — “State-wise Conviction Rates in India 2025” · indiadatamap.com
