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How the chain of custody works in Indian forensic practice, the four most common ways it breaks, and the leading appellate judgments that turned on it (Ashish Jain, Tomaso Bruno).
Chain of custody is the documented, unbroken record of every person who held, transferred, examined or stored a piece of evidence from the moment it was collected to the moment it was produced in court. The chain is what tells the trial judge that the bloodstain analysed at the FSL is the same bloodstain lifted from the floor. If any link is missing, ambiguous, or contradicted by another document, the analytical result behind it loses evidentiary weight, regardless of how rigorous the science was.
The thing most candidates miss is that chain of custody is not a forensic concept. It's an evidence-law concept that forensic practice has to comply with. The science is incidental. What the trial judge actually reads, in order, is the seizure memo, the forwarding memo, the FSL receipt, the analysis worksheet, and the deposit register. Any of those documents disagreeing with any other is the opening the defence needs.
A series of timestamped, signed handoffs.
The chain is not a metaphor. It's a literal series of timestamped, signed handoffs that, when laid end to end, account for every minute the evidence existed outside of secure storage. The standard Indian sequence runs from scene to FSL to court, with documented entries at each transition.
Four reliable failure modes.
Defence challenges to chain of custody tend to come from the same four places. Anticipating them is most of how a SOCO builds a chain that holds at trial.
A few non-obvious defence moves that have worked in Indian appellate courts:
Two cases every student should be able to summarise.
The Indian appellate jurisprudence on chain of custody is dominated by a handful of judgments that get cited repeatedly. Two are syllabus-essential.
The Rajasthan trial court convicted on the basis of recovered narcotics. The defence challenged the chain on the grounds that the seal-impression on the forwarding memo did not match the seal on the packet at FSL intake, and that the SHO's malkhana register entry was made three days after the seizure memo. The High Court reversed the conviction. The opinion is widely cited for the proposition that a broken seal-impression chain is fatal to the prosecution case independent of the analytical result.
The Supreme Court of India considered a homicide case in which significant chain-of-custody gaps appeared between the recovery of physical evidence and the FSL examination. The judgment is cited for the principle that the burden of establishing an unbroken chain rests on the prosecution, and that doubts in the chain are resolved in favour of the accused. The case is also referenced for what reliable evidence handling looks like in a homicide as opposed to a narcotics case.
What well-run states are now standardising on.
State FSLs have been converging on a "sealed packet protocol" that codifies the chain of custody into a specific, reproducible workflow. Maharashtra, Tamil Nadu, Delhi and the central CFSL bodies are furthest along; other states are catching up under BNSS 2023 pressure.
Standard elements of the protocol:
This protocol sits on top of, not in place of, the documentation work covered in Securing and Documenting the Crime Scene and the packaging work covered in Processing Physical Evidence. The chain is the meta-record that ties them together.
Mandatory FSL visits push the chain earlier into the case.
The Bharatiya Nagarik Suraksha Sanhita 2023 changed the chain in two material ways.
The combined effect is to push the chain earlier in time and to add a continuous audiovisual record to the documentary one. State FSLs and SOPs are still catching up to the implementation cost; we're at the early-implementation point in 2026, with the first real BNSS-era chain-of-custody appellate cases just starting to make their way through the High Courts.
Which document records the handoff of an evidence packet from the SOCO to the SHO at the police station?
Each transition between boxes is itself a small document. The seizure memo records the SOCO-to-SHO handoff. The forwarding memo records the SHO-to-FSL handoff. The FSL receipt records the intake. The deposit register records the analyst-to-malkhana handoff. The exhibit register records the court production. Five documents per item, minimum.