A Chain of Custody is in effect a paperwork trail for an event that
documents what the steps in the process were, and what individuals
were involved, at what time, and on what date, in the event, at each stage.
The term is often associated with drug tests, and when the NIDA
protocol is followed to the letter, all parties are assured that
the procedure leading up to the results is as represented and that
the results are for the individual named.