“Chain of custody” refers to the proper custody, or control, of the DNA samples throughout the testing process. First, it requires a neutral third party to properly identify the persons being tested and collect their DNA samples. Next, it requires the DNA samples and paperwork to be delivered to the testing location without being tampered with. Finally, it requires proper handling of the DNA and paperwork by a qualified laboratory.
The sample IDs are tracked and documented throughout the testing process. This process enables the laboratory to produce notarized test results that can be used in court.