I was in a deposition with Dr. Broun a few years ago where he was testifying as an "expert" medical witness.  He billed himself as practicing family medicine and the periodical AMA News lists him as a family physician, but he has never graduated from a family practice medical residency program.  In fact, he hasn't graduated from any residency program.  

He saw patients as a physician but he didn't do lab work, he didn't administer vaccines, he didn't do diagnostic imaging studies, he didn't practice out of a clinic, he didn't keep medical records, and he carried no malpractice insurance.

He had been in a neurosurgical residency program, but testified that he quit because of a philosophical difference of opinion with an attending doctor.  If true, this would be amazing.  I suspect he was asked to leave for good reason after his transition year.

An investigation of this would make a great comedy segment.  As one of a few members of Congress that is a medical doctor,  Dr. Broun is often cited as an "expert" in this field when he is actually the least qualified licensed physician I know.