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DOT Regulations - 49 CFR Part 40
Subpart G—Medical Review Officers and the Verification Process

§ 40.165 To whom does the MRO transmit reports of drug test results?

December 18, 2025 17:58

(a) As the MRO, you must report all drug test results to the DER, except in the circumstances provided for in § 40.345.

(b) If the employer elects to receive reports of results through a C/TPA, acting as an intermediary as provided in § 40.345, you must report the results through the designated C/TPA.

This information was copied from a federal government resource. Always verify the accuracy of this information against the most recent version of the Code of Federal Regulations: https://www.ecfr.gov/current/title-49/subtitle-A/part-40 or the Office of Drug & Alcohol Policy & Compliance: https://www.transportation.gov/odapc.

Articles in this section

§ 40.121 Who is qualified to act as an MRO?
§ 40.123 What are the MRO's responsibilities in the DOT drug testing program?
§ 40.125 What relationship may an MRO have with a laboratory?
§ 40.127 What are the MRO's functions in reviewing negative test results?
Section 40.127 Questions and Answers
§ 40.129 What are the MRO's functions in reviewing laboratory confirmed non-negative drug test results?
§ 40.131 How does the MRO or DER notify an employee of the verification process after receiving laboratory confirmed non-negative drug test results?
Section 40.131 Questions and Answers
§ 40.133 Without interviewing the employee, under what circumstances may the MRO verify a test result as positive, or as a refusal to test because of adulteration or substitution, or as cancelled because the test was invalid?
§ 40.135 What does the MRO tell the employee at the beginning of the verification interview?