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Reconstruct a sample's chain of custody.

Follow sample collection, transfers, storage and receipt to distinguish a traceability gap from a confirmed handling event.

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Illustration of a seal beside a sample transport case and study records.

You: Reconstruct custody for S-106's second aliquot. Where is the gap?

neil

A2 was dispatched at 09:05 and received at 11:40. The intermediate handoff is unrecorded. I can show the 2-hour-35-minute interval, but not who held the aliquot or what conditions applied throughout it.

Intermediate custody evidence missing
Intermediate custody evidence missing. 08:20 Collected, 09:05 Dispatched, 11:40 Received. Example records.08:20Collected09:05Dispatched11:40Received

You: Does that interval prove the sample was mishandled?

neil

No. It establishes an evidence gap, not an excursion. I would trace A2's identity through the carrier, handoff and receipt records and obtain applicable condition evidence. The parent's collection record and the other aliquot's custody cannot substitute for A2's path.

You: Write this up for review, with the sources and the follow-up work we need.

neil

Here is the draft. I have kept the supported finding separate from the open questions, and prepared the evidence requests for the responsible roles.

S-106 A2 custody reconstructionReview draft · source evidence and assessment

S-106 A2 custody reconstruction

The 155-minute dispatch-to-receipt interval is documented; the intervening custody and conditions are not. Follow aliquot A2 rather than assuming the parent sample's history applies unchanged. Locate the handoff, carrier and storage evidence and check their timestamps against the recorded movements. The gap in documentation does not, by itself, prove an excursion or establish suitability.

Source evidence and search scope

S-106 (Collection); MOVE-106 (Dispatch); RCPT-106 (Receipt)

S-106 / Collection

Recorded evidence
Collected 08:20; two aliquots created

MOVE-106 / Dispatch

Recorded evidence
Aliquot A2 dispatched 09:05 to analytical laboratory

RCPT-106 / Receipt

Recorded evidence
Received 11:40; intermediate handoff not recorded
Inputs needed for your own records
  • Parent sample and aliquot identities
  • Collection, transfer, storage and receipt events
  • Handling requirements and supporting files

The sample owner assesses handling suitability and any impact on testing. Missing custody evidence is not itself proof that storage conditions were breached.

Fictional source snapshots. No live query, assignment or approval.

Follow-up work and evidence requests2 proposed tasks · not assigned

Evidence to request

Locate the intermediate handoff
Sample coordinator
Identify A2's dispatch, carrier, custodian and receipt references, with timestamps and any unresolved identity changes.
Assess condition evidence for the gap
Sample reviewer
Obtain transport/storage records and evaluate suitability for the intended test. Do not infer an excursion or suitability from missing custody alone.
Example conversation · prepared replies

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What to bring for this job
  • Parent sample and aliquot identities
  • Collection, transfer, storage and receipt events
  • Handling requirements and supporting files

Source access, permissions and permitted actions are agreed for your environment.

Source excerpt

S-106

Collection

Recorded evidence
Collected 08:20; two aliquots created

Selected fictional record, not a live source-system view.

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