What is the chain of custody and why is it important?

Chain of custody is a critical process in workplace drug and alcohol testing that ensures the integrity of each sample from collection to results. It involves documented handling and transfer of samples at every stage, including lab testing and result reporting. This strict procedure helps prevent tampering, misidentification, contamination, and confidentiality. It also ensures that test results are legally defensible. Maintaining an unbroken chain of custody protects both employers and employees by supporting fair, transparent, and accurate testing outcomes.