The U.S. Department of Transportation (DOT) ensures public safety by enforcing strict alcohol and drug testing regulations for safety-sensitive employees. If they are caught violating those regulations, they will be required to complete a DOT Return to Duty Program.
Who Must Comply with DOT Drug and Alcohol Regulations?
DOT regulations apply to employees in safety-sensitive positions across multiple transportation sectors, including:
- Commercial truck and bus drivers (regulated by FMCSA)
- Pilots, flight attendants, and air traffic controllers (regulated by the FAA)
- Train engineers and conductors (regulated by the FRA)
- Maritime crew members (regulated by the USCG)
- Pipeline workers and control room operators (regulated by PHMSA)
- Transit employees (regulated by FTA)
If an employee performs duties that affect transportation safety, such as operating a vehicle or conducting maintenance, they are subject to DOT testing requirements.
When Are Employees Tested?
DOT regulations (49 CFR Part 40) outline mandatory drug and alcohol testing under the following circumstances:
- Pre-employment – Before an individual begins safety-sensitive work
- Random testing – Unannounced and statistically selected throughout the year
- Reasonable suspicion – Based on observed behavior or appearance
- Post-accident – After qualifying accidents
- Return-to-duty – After a previous violation and before resuming work
- Follow-up testing – Conducted over at least 12 months after returning to duty
What Substances are Tested For?
DOT drug tests screen for the following five drug classes:
- Marijuana (THC)
- Cocaine
- Amphetamines (including methamphetamine and ecstasy)
- Opioids (including codeine, morphine, heroin, oxycodone, hydrocodone, and fentanyl)
- Phenyclidine (PCP)
Alcohol testing is also performed using breath or saliva to detect concentrations at or above 0.02%
Consequences of a Positive Test
If an employee tests positive for drugs or has a blood alcohol concentration (BAC) of 0.04% or greater, they must be immediately removed from safety-sensitive duties and referred to a Substance Abuse Professional (SAP).
Consequences include:
- Mandatory evaluation by a DOT-qualified SAP
- Completion of an education and/or treatment program
- Successful return-to-duty test
- Unannounced follow-up testing (minimum of 6 times in the first 12 months) Refusing to test or tampering with a test carries the same consequences as a positive Employer Responsibilities
DOT-regulated employers are required to:
- Develop a written drug and alcohol testing policy
- Use certified laboratories and trained collectors
- Maintain records and report violations to the appropriate authorities (e.g., FMCSA Clearinghouse)
- Ensure employees receive education on testing procedures and consequences
Completing the DOT Return to Duty Program
At AACS Counseling, we specialize in the DOT Return to Duty Program. We help guide employees through the necessary steps to become eligible to return to work.
“If you’re facing a legal issue or need a professional evaluation, AACS Counseling is here to help. Call us today at 800.683.7745 or visit our website to schedule your appointment.”
