Originally Posted by
NorfolkSouthern
If you ever tried to take an FAA medical examination, and got denied a medical certificate, then your driver's license would be ineligible, and for that reason, it would be illegal for you to fly a light-sport aircraft. Either a driver's license, or third class medical is needed. If a third class medical was denied, suspended, or revoked, then you would not be able to use your driver's license as a medical certificate. But if you have never taken the physical, then your driver's license would work ONLY in that case, and ONLY for light-sport.
I can tell you that is absolutely false. If you fail an airman exam it can be for a multitude of reasons, the majority of which will not exclude one from a driver's license nor cause their cancellation. The rules written by the FAA in regards to the medical examination have become far more intrusive than in previous years and have included a multitude of new medications that are common in the general population which will make you exempt from a medical certificate.