Controlled substance identified,
Section 391.41(b)(12) states: A person is physically qualified to drive a CMV if that person does not use a controlled substance identified in 21 CFR 1308.11, Schedule I, an amphetamine, a narcotic, or any other habit-forming drug. Exception: A driver may use such a substance or drug, if the substance or drug is prescribed by a licensed medical practitioner who is familiar with the driver’s medical history and assigned duties; and has advised the driver that the prescribed substance or drug will not adversely affect the driver’s ability to safely operate a CMV. This exception does not apply to methadone.
Medical Examiners are required to give careful consideration to the effects of medications on a driver’s ability to operate a CMV safely before rendering the driver qualified.
For information on specific drugs and CMV driver qualification, please visit the Federal Motor Carrier Safety Administration's Medical Program website. Questions about the effects of many drugs and driver qualification are answered in the Frequently Asked Questions (FAQs) section. You may also e-mail your questions to the Physical Qualifications Division at firstname.lastname@example.org or call and ask for a Specialist on (202) 366-4001.