The united states department of transportation has initiated new substance abuse professional guidelines that apply to over 7 million safety-sensitive transportation positions including school bus drivers, boat captains, tractor trailer drivers and airline pilots. according to the new regulations, any safety-sensitive individual who refuses a drug test, tests positive for a drug test, or has a breath alcohol concentration of .04 or higher will be immediately removed from duty and referred to a substance abuse professional. dr. wilson is an approved substance abuse professional provider and will gladly help all professionals move forward with their lives and careers.