What does 49 CFR 40.145 (On what basis does the MRO verify test results involving adulteration or substitution?) require?

As an Ask X3 fleet-compliance assistant, here is what 49 CFR 40.145 requires when an MRO receives a laboratory report that a specimen is adulterated or substituted:

* Initial Handling: The MRO must treat the report the same way they treat a confirmed positive drug test and follow standard verification procedures.

* Verification Interview: During the interview, the MRO must explain the lab findings to the employee and address any technical questions or issues raised.

* Burden of Proof: The MRO must offer the employee the opportunity to present a legitimate medical explanation for the findings. The employee carries the burden of proof to show this explanation exists, and must present this information during the interview (though the MRO has the discretion to extend this time by up to five days if there is a reasonable basis to believe the employee can produce relevant evidence).

* Specific Proof Required:

* For an adulterated specimen, the employee must demonstrate that the adulterant entered the specimen through physiological means.

* For a substituted specimen, the employee must demonstrate that they did produce, or could have produced, urine through physiological means that meets the creatinine and specific gravity criteria. Simply citing personal characteristics or a medical condition/diagnosis is not enough on its own; the employee must prove that those factors actually result in the physiological production of urine meeting those criteria.

* MRO Decision-Making (49 CFR 40.145):

* The MRO uses their best professional judgment to decide if a legitimate medical explanation has been established.

* Neither the MRO nor the employer is responsible for arranging, conducting, or paying for studies, examinations, or analyses (including referral physicians) to determine if a medical explanation exists, though reasonable assistance must be given to the employee upon request.

* If the explanation does not present a reasonable basis, the MRO must report the test to the DER as a verified refusal to test.

* If the explanation may present a reasonable basis, the MRO must direct the employee to obtain a further medical evaluation from an acceptable referral physician within five days. The MRO will consult with the referral physician, seriously consider their written recommendation, and then either cancel the test (if a legitimate medical explanation is determined) or report it as a verified refusal to test (if not).