Resources

Find a Medical Review Officer (MRO)

Every DOT drug test result goes through a certified MRO before it reaches the employer. Use the directories below to find a qualified MRO for your program.

What Is an MRO?

The MRO's Role in DOT Drug Testing

A Medical Review Officer (MRO) is a licensed physician who receives and reviews laboratory results for DOT federally mandated drug tests. The MRO is a required part of every DOT drug testing program — results cannot be reported directly to an employer without MRO review.

🔬 Reviews Lab Results

The MRO receives the chain-of-custody form and laboratory result, then reviews each result for medical accuracy and legitimacy before reporting it to the employer.

📞 Contacts the Donor

For non-negative results, the MRO contacts the employee directly to ask whether there is a legitimate medical explanation — such as a valid prescription — for the result.

✅ Reports Final Results

The MRO determines whether the final result is negative, positive, cancelled, or refusal to test — and reports that determination to the employer or C/TPA.

⚖️ Ensures Due Process

The MRO protects employees from false positives while protecting the integrity of the testing program — a legally required safeguard in federal workplace drug testing.

Who Needs an MRO?

Required for Every DOT Drug Testing Program

Under 49 CFR Part 40, every DOT-regulated employer must designate an MRO for their drug testing program. This includes employers in:

  • ✓ FMCSA — commercial motor vehicle operators (trucking, bus)
  • ✓ FAA — aviation personnel in safety-sensitive roles
  • ✓ FRA — railroad employees
  • ✓ FTA — mass transit employees
  • ✓ PHMSA — pipeline and hazardous materials workers
  • ✓ USCG — maritime crewmembers
Collectors and BATs do not perform the MRO's role. Your job as a collector or BAT is to collect the specimen or conduct the breath test correctly. The MRO handles the laboratory result review. These are separate, required functions in the DOT testing chain.
MRO Credentials

What Qualifies an MRO?

Under 49 CFR §40.121, an MRO must be a licensed physician (M.D. or D.O.) who has completed training in federal drug testing regulations and passed a qualifying examination administered by a nationally recognized MRO certification board. The two primary certifying organizations are:

MROCC Medical Review Officer Certification Council — administers the CMRO (Certified Medical Review Officer) examination and maintains a directory of certified MROs.
AAMRO American Association of Medical Review Officers — provides MRO training, certification, and a searchable directory to locate certified MROs nationwide.
MRO Directories

Find a Certified MRO

Both organizations maintain searchable directories of certified MROs. Use either to find a qualified MRO for your employer or testing program.

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MROCC — Medical Review Officer Certification Council

The MROCC is one of the primary DOT-recognized MRO certifying bodies. Their directory allows employers, C/TPAs, and collectors to search for CMRO-certified physicians by location. MROCC also sets standards for MRO training and examination under 49 CFR Part 40.

Visit MROCC Directory →
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AAMRO — American Association of Medical Review Officers

AAMRO is the largest professional association for MROs in the United States. Their searchable directory lists AAMRO-certified MROs nationwide. AAMRO also provides MRO training courses and publishes guidance on DOT drug testing regulations and MRO responsibilities.

Visit AAMRO Directory →
Note: TestRight Academy is an independent training provider and is not affiliated with MROCC or AAMRO. These links are provided as a resource only. Always verify that any MRO you select holds a current certification recognized under 49 CFR Part 40.

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