Scoabie
Member
This was copied from a websiteChain of custody refers to a system of controls and procedures that document the progress of a sample from the point of collection through the laboratory to its disposal after the results have been accepted. It’s important to note that for random testing the chain of custody process starts from the point at which the donor is chosen. This is to ensure that the donor has been fairly chosen at random and the collection is not undermined, which in turn could affect the validity of the results.