Who determines whether an accident qualifies for a DOT post accident drug or alcohol test?

The supervisor at the scene of the accident/event should know the testing criteria and make a good faith effort decision to test or not test based on the information available at the time. The supervisor may consult with others, but the supervisor is the person who has to make the decision. If the testing cannot happen within the required time, the supervisor must document the reasons. Any employee required to be tested but needs medical assistance, must get the needed medical assistance first.