Initiating drug testing is probably one of the more uncomfortable tasks associated with being a supervisor. But you can alleviate some of the discomfort by knowing the federal rules and regulations regarding testing-so you never feel like you're making split-second decisions. The U.S. Department of Transportation (DOT) carefully outlined these rules for you, according to the stipulations of the 1991 Omnibus Transportation Employee Testing Act. This course provides the specifics of when you're required to send an employee for drug testing.