What do the FMCSA regulations say about my driver who has a current medical certificate but has developed a medical condition that would make the operation of a commercial motor vehicle (CMV) questionable and possibly unsafe?

What do the FMCSA regulations say about my driver who has a current medical certificate but has developed a medical condition that would make the operation of a commercial motor vehicle (CMV) questionable and possibly unsafe?

FMCSA regulations prohibit a driver from beginning or continuing to drive if their ability and/or alertness is impaired by: fatigue, illness, or any cause that makes it unsafe to begin (continue) to drive a commercial vehicle.

Even if a driver currently has a valid medical certificate, the driver is prohibited from driving a CMV with any medical condition that would be disqualifying or may interfere with the safe operation of a CMV. Once a disqualifying medical condition is resolved, and before resuming operation of CMV, a driver is responsible for obtaining re-certification from a Medical Examiner. FMCSA CFR 391.45