Services
DOT Drug Testing for Employers
What Is DOT Drug Testing?
DOT drug testing is federally required drug and alcohol testing for employees in safety-sensitive jobs regulated by the U.S. Department of Transportation. It follows strict rules set out in 49 CFR Part 40 — covering everything from how specimens are collected to how results are reviewed and reported.
If you employ commercial drivers (CDL), pilots, railroad workers, transit employees, pipeline workers, or maritime workers, you likely need DOT-compliant drug testing.
Which Employers Need DOT Drug Testing?
Your employees need DOT drug testing if they work in safety-sensitive roles under any of these agencies:
- FMCSA — Commercial truck and bus drivers (CDL holders)
- FAA — Aviation workers (pilots, mechanics, air traffic control)
- FRA — Railroad employees
- FTA — Mass transit workers
- PHMSA — Pipeline operators
- USCG — Maritime workers
If you're not sure whether your employees are DOT-covered, ask your Designated Employer Representative (DER) or your third-party administrator (TPA).
What Types of Tests Are Required?
Under DOT rules, employers must test covered employees in these situations:
- Pre-employment — Before starting a safety-sensitive role
- Random — Unannounced draws from your employee pool throughout the year
- Post-accident — After qualifying accidents or incidents
- Reasonable suspicion — When a trained supervisor documents signs of impairment
- Return-to-duty — After a violation, before returning to safety-sensitive work
- Follow-up — Ongoing testing after return-to-duty
What Is Tested in a DOT Drug Test?
The standard DOT drug panel tests for 5 drug categories:
- Marijuana (THC)
- Cocaine
- Opioids (including codeine, heroin, morphine, hydrocodone, oxycodone)
- Amphetamines (including methamphetamine and MDMA)
- Phencyclidine (PCP)
Most DOT drug tests use a urine specimen. Oral fluid is now authorized for certain modes — confirm with your DER and TPA before switching.
What Is an MRO (Medical Review Officer)?
An MRO is a licensed physician who reviews non-negative drug test results before they're reported to your company. The MRO may contact the employee to ask about legitimate prescriptions or medical explanations — then issues a final verified result. This protects both the employer and the employee from unfair outcomes.
How We Handle DOT Drug Testing
When you work with us:
- We confirm your operating administration (FMCSA, FAA, etc.) and test reason
- We arrive at your location with DOT-approved forms and supplies
- Collections follow Part 40 procedures — including direct observation when required
- Specimens are packaged and sent to your TPA, MRO, or certified lab
- Documentation is audit-ready for your DER and safety office
Common questions
- Does a CDL driver need a DOT drug test before they start driving?
Yes. A negative pre-employment DOT drug test is required before a covered employee performs any safety-sensitive duties for your company.
- Can we do DOT drug testing at our yard instead of a clinic?
Yes — that's exactly what we do. We bring the collection to your terminal or yard so drivers don't leave the property.
- What happens if an employee fails a DOT drug test?
They must be immediately removed from safety-sensitive duties. They can only return after completing a SAP (Substance Abuse Professional) evaluation, treatment if required, and a return-to-duty test.
Get a DOT testing quote
Share your operating administration, test reason, and site location—we'll confirm Part 40 collection logistics before you schedule.