To remain DOT compliant, all commercial motor vehicle drivers must enroll in the following Drug tests. 

1. Pre Employment Drug Test: Before operating a commercial vehicle, every CDL driver/company/owner-operator must enroll and complete a pre-employment drug test and get a negative test report.
2. Post-Accident Drug Test: The type of test depends on the impact and the injuries sustained by the victims. A driver then has to undergo a drug and alcohol test to determine his(er) liability.
3. Random Drug Test: Keeping self DOT compliant, owner-operator, and transportation employees of the companies must join a consortium pool and enroll for random drug and alcohol tests all round the year. Under DOT regulation 382.305, every CDL employer must comply with a minimum yearly ratio rate for random drug testing.
   As of January 1, 2020, the DOT set the limit of sudden/unplanned drug test percentage rate at 50%, and the spontaneous alcohol test percentage rate at 10% for motor carriers.
4. Reasonable Suspect Drug Test:An employer has every right to call for a suspect drug test if the employer has a valid reason against an employee under the influence of drugs or alcohol during the working hours. The employee is answerable and can not deny such a call.
5. Return-To-Duty Drug Test:If an employee is tested positive for drugs and alcohol, he should return with a damaging result report for a Return-to-duty drug test. And must be clean to get a negative return-to-duty result before resuming his work.
6. Follow Up Drug Test:An employee who has completed a return-to-duty process (incorporate a negative return-to-duty test) must randomly test several times throughout the year.