Chain of custody is the documented history of a specimen from collection through testing, storage, and final disposal. It helps show that the reported result belongs to the correct person and that the specimen was controlled, sealed, transferred, and analyzed without an unexplained break.
What chain of custody records
A complete record links the donor, specimen ID, collector, date and time, seals, shipment, laboratory receipt, internal laboratory transfers, testing aliquots, storage, and disposition. Each person who takes control records the transfer or uses an approved electronic system that provides equivalent accountability.
The record is not proof that no error could ever occur. It is an auditable trail that helps identify whether an error occurred and whether it affects the result.
The federal Custody and Control Form
Federal workplace and DOT drug tests use the Federal CCF. It carries the specimen ID and required information across the collection site, laboratory, MRO, employer representative, and donor copies. The 2026 CCF and current instructions should be used according to transition rules; expired forms can create correctable or fatal flaws depending on the circumstances.
The collector verifies identity, records the specimen and test information, certifies the collection, and documents release to the delivery service. The donor certifies that the specimen was provided and that the sealed bottles and identifying information are correct.
Seals and specimen identifiers
Tamper-evident seals must be placed over the bottle caps or required closure points, dated, and initialed as the procedure requires. The number on the bottles must match the form. At accessioning, the laboratory checks seal integrity, identifiers, quantity, leakage, and the accompanying documentation before accepting the specimen.
External and internal custody
External custody covers transfers from the collection site to the laboratory. Internal laboratory custody tracks the specimen and each aliquot used for screening, confirmation, validity testing, retesting, or storage. Secure access, time-stamped records, and documented disposal are part of the control system.
What counts as a break?
Examples include an unsealed bottle, irreconcilable specimen numbers, an undocumented transfer, missing collector certification, or a specimen that cannot be linked to the donor. Not every clerical mistake invalidates a test. Federal rules distinguish flaws that can be corrected with reliable documentation from errors that require rejection or cancellation.
A memorandum or affidavit should never be used to invent an event that did not occur. It may clarify a contemporaneous act when the rule allows correction and the responsible person can document what happened.
Electronic custody systems
Approved electronic CCF systems can replace portions of the paper trail. They must preserve authentication, timestamps, required signatures or attestations, access controls, audit history, and linkage between the electronic record and physical specimen package. Federal programs limit use to systems and laboratories approved for that purpose.
Why chain of custody matters in disputes
A challenge should identify the specific claimed defect and how it could affect identity, integrity, or reliability. A minor typo with an intact specimen link is different from an unexplained broken seal or mismatched ID. Relevant records can include the donor copy, collector notes, shipping record, accession log, internal custody, instrument batch, and MRO report.
For the next stage, read How Laboratories Confirm Drug-Test Results.
Sources
- SAMHSA: Federal Custody and Control Forms
- SAMHSA: Guidance for the 2026 Federal CCF
- U.S. DOT: 49 CFR Part 40
Scientific and regulatory review: October 29, 2026.