What is the purpose of a Chain of Custody (COC) in sample management?

The purpose of a Chain of Custody (COC) in sample management is to provide a comprehensive record of possession, transfer, and custody of a sample from the moment it is collected until the time it is analyzed or disposed of. This documentation is crucial for ensuring the integrity and reliability of the data obtained from the sample. A proper COC helps to maintain the sample's authenticity, safeguarding it against tampering or contamination, and ensures that the results of any tests conducted on the sample are defensible and credible in legal and regulatory contexts.

Implementing a COC also allows for precise tracking of who handled the sample at each stage of the process, ensuring transparency and accountability. This is particularly important in situations where the results can impact public health, safety, or legal decisions. Thus, the COC serves as a vital component in maintaining evidence integrity, facilitating a trustworthy and thorough analysis of water quality.