Why is maintaining a proper chain of custody important in field samples?

• A. It ensures sample integrity, traceability, and admissibility of results in investigations.
• B. It ensures samples are never tested.
• C. It guarantees results are always favorable.
• D. It is only required for legal cases in civil court.

Answer: (A)

Maintaining a proper chain of custody centers on preserving the sample’s integrity and creating a traceable history from collection through analysis. By documenting who handled the sample, when, where it was collected, how it was stored and transported, and any analyses performed, you prevent contamination, mislabeling, or tampering and you establish authenticity. This documented trail is what allows the results to be trusted and admissible in investigations or proceedings, since it shows the sample’s handling could be reproduced and verified under scrutiny.

The other options don’t fit because: samples aren’t guaranteed to never be tested—testing happens to determine results; results aren’t guaranteed to be favorable—objective testing aims to avoid bias; and chain of custody isn’t limited to civil court—it’s essential for any scenario where sample results might be used in investigations, public health decisions, or legal contexts.