General Knowledge · Alcohol, Other Drugs, and Driving
When does the federal drug prohibition NOT apply to a driver taking medication?
1.When a licensed medical practitioner has instructed the driver to take the substance and has advised that it will not affect the driver's ability to safely operate the vehicleCorrect answer
2.Any prescription medication is automatically exempt, regardless of whether the prescribing doctor said anything at all about whether it is safe to drive a vehicle while taking it
3.Only over-the-counter medication is exempt from the federal drug rule, since a prescription drug is never allowed at all while the driver is on duty
4.A driver must first obtain written approval from the FMCSA before taking any prescribed medication while driving a commercial motor vehicle on duty
Explanation
The exception applies when a licensed medical practitioner has instructed the driver to take the substance and has specifically advised that it will not affect the driver's ability to safely operate the vehicle, under 49 CFR 392.4(c). The wrong options each skip the safety-advisement requirement that makes the exception apply: a prescription alone is not automatically exempt without that advisement, over-the-counter status has nothing to do with the actual exception, and no FMCSA approval process exists for this purpose.
Source: 49 CFR 392.4(c)
Related Alcohol, Other Drugs, and Driving questions
- How long before going on duty or operating a commercial motor vehicle must a driver avoid using alcohol or being under its influence?
- What is the federal rule on alcohol use while a driver is on duty, operating, or in physical control of a commercial motor vehicle, separate from the 4-hour pre-duty rule?
- Which of the following is prohibited for a driver who is on duty, under 49 CFR 392.4?
- If a driver becomes too ill to drive safely, what is the correct response?