Medical Review Officers (MRO) are licensed physicians who have been trained and certified to review the lab results and to validate whether a test is positive. MROs receive laboratory confirmed urine drug test results; determine whether there is a legitimate medical explanation for a laboratory confirmed positive, adulterated, or substituted result; and review and report a verified result to the designated employer representative (DER) in a timely and confidential manner. Regulations concerning MROs and the verification process are found in 49 CFR Part 40 Subpart G.

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