Chain of Custody: What Breaks It, and What Indian Courts Have Said

The chain is a literal series of timestamped, signed handoffs that, 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.

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.

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.

• Time gaps. Any period during which the evidence is not accounted for in any register. A two-hour gap between the seizure memo timestamp and the station register entry is a defence opening.
• Seal discrepancies. The seal impression on the forwarding memo doesn't match the seal on the packet at FSL intake. Or the packet has an extra seal added at some intermediate point.
• Signature gaps. A handoff happened but the receiving party didn't sign. This routinely happens at malkhana entry when night-shift constables accept packets without entering them.
• Quantity drift. The weight, volume, or count of an item changes between custodians without an explanation. This is the most common attack on narcotics cases, where moisture loss or analytical sampling reduces the gross weight.

A few non-obvious defence moves that have worked in Indian appellate courts:

• Cross-referencing the IO's case diary against the forwarding memo. If the case diary doesn't mention the IO leaving the station to forward the packet on the date the forwarding memo claims, both documents lose weight.
• Demanding the original duty diary of every custodian. Photocopies are not enough; originals are inspected for page-sequence integrity.
• Inspecting the FSL malkhana register for the relevant date range. A packet that was supposedly in the malkhana but isn't logged in the deposit register has no continuous custody record.

Indian appellate jurisprudence on chain of custody returns repeatedly to a handful of judgments. Two are the most frequently cited.

Ashish Jain v State of Rajasthan

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.

Tomaso Bruno v State of UP

The Supreme Court of India considered a homicide case involving Italian nationals in Varanasi in which the prosecution failed to produce CCTV footage and other best evidence. The judgment is cited for the principle that in a case based on circumstantial evidence the chain of circumstances must be complete with no gap, and that the benefit of doubt is resolved in favour of the accused. The case is referenced for the prosecution's duty to preserve and produce key evidence, not specifically for physical custody documentation gaps between recovery and FSL examination.

State FSLs have been converging on a sealed-packet protocol that codifies chain-of-custody requirements into a specific, reproducible workflow. Maharashtra, Tamil Nadu, Delhi, and the central CFSL bodies are furthest along; other states are following under BNSS 2023 pressure.

Standard elements of the protocol:

• The seal is impressed onto the forwarding memo at the time of sealing, not later. Late impressions are evidence of post-facto handling.
• The seal carries a personal identifier (typically the SOCO's name and ID), not a generic station seal. Personal seals are harder to forge and create direct accountability.
• The malkhana entry is made within 24 hours of seizure. Anything later is flagged as a gap and must be explained in the case diary.
• The FSL intake clerk co-signs the seal-inspection by initialling the forwarding memo at the seal-impression box. This creates a contemporaneous record of the seal's state at receipt.
• Photographic proof of the sealed packet is increasingly mandated, with the photograph entered into the case file. The photograph timestamp must agree with the seizure memo timestamp to within a defined tolerance (typically 30 minutes).

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.

The Bharatiya Nagarik Suraksha Sanhita 2023 changed the chain in two material ways.

• Mandatory FSL team presence at the scene for offences punishable with 7+ years. Section 176(3). The chain now starts from the FSL's arrival at the scene, not from the moment the IO transports the packet to the FSL.
• Mandatory videography of search and seizure. Section 105. The seizure is recorded in real time, which makes the seizure memo cross-checkable against the video. Defence counsel routinely demand the video, and any divergence between the memo and the recording undermines both.

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 requirements. As of 2026, the first BNSS-era chain-of-custody appellate cases are beginning to make their way through the High Courts.