Return to Duty Process: A program allowing DOT-regulated employees who violated drug use regulations to demonstrate rehabilitation and regain their safety certification.

Motor Skills: Abilities that allow us to control our movements.

Zero-Tolerance Policy: A strict policy with no exceptions or allowances.

Safety-Sensitive Roles: Positions in the transportation industry that directly impact public safety, such as truck drivers, pilots, and train operators.

Department of Transportation (DOT): The U.S. government agency responsible for regulating safety in various transportation sectors.

Cognitive Functions: Mental abilities involved in thinking, learning, and problem-solving.