What is DOT drug testing?
DOT stands for the U.S. Department of Transportation. Federal law requires DOT testing for employees in safety-sensitive jobs, including:
- Commercial truck drivers (CDL holders)
- Pilots and aviation staff
- Train operators
- Pipeline workers
- Maritime crew members
What makes DOT testing different:
- It follows federal rules under 49 CFR Part 40.
- It uses a 5-panel urine test for marijuana, cocaine, amphetamines, opiates, and PCP.
- Tests happen at set times: pre-employment, random, post-accident, reasonable suspicion, return-to-duty, and follow-up.
- Specimens go to certified labs, and a Medical Review Officer (MRO) reviews results.
What is non-DOT drug testing?
Non-DOT testing is not regulated by federal law. Private companies, local agencies, and organizations outside DOT jurisdiction use it, and employers can tailor it to their own policy. It is common in construction, manufacturing, healthcare, retail, and non-federal government offices.
- Flexible panels: 5, 10, or more substances
- Urine, saliva, hair, or nail specimens
- Can screen for more substances, such as benzodiazepines, barbiturates, synthetic opioids, and MDMA (ecstasy)
- Employers set their own policies and procedures
- Used for pre-employment, random, and post-incident testing
| DOT | Non-DOT | |
|---|---|---|
| Who it covers | Federally regulated, safety-sensitive jobs | Any employer, agency, or individual |
| Rules | 49 CFR Part 40 | Company policy and state law |
| Panel | 5-panel urine | 5, 10, or custom panels |
| Specimens | Urine (plus breath alcohol) | Urine, saliva, hair, nail |
| Flexibility | Fixed by federal rules | Set by the employer |
Which one do you need?
- Federally regulated, safety-sensitive job: DOT testing is required.
- Private employer, or personal and legal testing (CPS, custody, court): non-DOT testing is usually the right fit.
NTS offers both DOT and non-DOT testing, in our clinic or onsite at your location.