Chain-of-custody and MRO review are critical and that is why most drug-testing programs follow the forensic protocol. And the example of non-forensic drug-testing parolees and probationers is misleading. Any Employee Assistance Program that has a union or some other group looking out for their best interests uses strict “forensic” guidelines. Parolees and probationers have no power and have no choice.Source: ASAM plan to have doctors drug test Almost everyone using non- FDA approved testing