What does the medical review officer (MRO) do?
Once a test is determined to be positive by the lab, there must be a review and also interpretation of the result. The MRO will look for a medically valid reason for the positive result. The MRO will also look for procedural errors such as chain of custody problems. A MRO is a required part of any DOT- regulated program, and highly recommend for non DOT testing. The MRO must be a licensed physician with knowledge of substance abuse disorders.
