To find a qualified medical professional who meets federal standards and to make sure that the health of your company's drivers meets all the standards for driving a commercial vehicle, you can use the national register of certified medical experts. All medical experts registered in the national register have undergone a special training course and passed a certified exam, and this register includes doctors, nurses, physician assistants and chiropractors. According to modern standards, all drivers of commercial vehicles are required to be examined by medical experts who are included in the national register, in order to improve safety by conducting high-quality medical examinations. The core mission of the U.S. DOT FMCSA is to reduce crashes, injuries, and fatalities involving large trucks and buses. The Medical Programs Division of FMCSA promotes the safety of America's roadways through the promulgation and implementation of medical regulations, guidelines and policies that ensure commercial motor vehicle drivers engaged in interstate commerce are physically qualified to do so. The Federal Motor Carrier Safety Regulations require commercial motor vehicle drivers to be examined and certified by a Medical Examiner at least once every two years.