TCOLE Professional Policing Practice Test

Chain of custody is the documented, unbroken trail of evidence from the moment it is collected to when it is presented in court. It records every person who handled the item, along with dates, times, locations, and how it was stored or transferred. This ongoing record, often kept on a chain-of-custody form, protects the evidence’s integrity by showing it has not been altered, contaminated, or replaced, which helps establish its admissibility in court. For example, if a blood sample is collected at a scene, placed in a sealed container with a unique identifier, logged, and then transported to the forensic lab with signatures, the chain-of-custody documentation records each transfer and possession change.

Storing location alone doesn’t capture who touched the evidence or the sequence of transfers, so it doesn’t fully demonstrate integrity. A log of police reports pertains to paperwork about incidents, not the physical handling of evidence. A policy requiring chain-of-custody procedures describes rules and expectations, but the actual chain-of-custody document is what proves who handled the evidence and that it remained unchanged.