What does chain-of-custody refer to in drug testing?

What does chain-of-custody refer to in drug testing?

• A. The order in which tests are run
• B. The record of the specimen's custody and handling
• C. The brand of testing instrument
• D. The time of day the test is performed

Answer: (B)

Chain-of-custody is the documented history of a specimen’s handling from collection through transport, receipt at the lab, processing, storage, and ultimate reporting of results. It records who collected the specimen, every person who handled it, dates and times, how it was stored and sealed, and any transfers or changes in custody, often with signatures on custody forms. This trail is essential to prove the specimen’s integrity and authenticity—showing it hasn’t been swapped, tampered with, or contaminated—so the test results are reliable and defensible in audits or legal settings. The other ideas—like the order of tests, the brand of instrument, or the time of day the test is performed—don’t establish this kind of traceable, protective record of handling.