If a second collection were required, it would have been indicated on the MRO verification statement. What was the reason for the canceled test? If it was a Random test, no recollection is required or allowed. However, in the case of a Pre-Employment, Return-to-Duty or Follow-Up test, the driver must submit to a recollection. For these three test types, the regulations require that an employee has a negative result before performing safety-sensitive duties.