Just like drivers of automobiles in Iowa and other states in the nation must pass a written test and a driving test to obtain a driver's license, drivers of commercial vehicles such as semi-trucks must also pass tests to get a commercial vehicle license. In fact, drivers have more strict guidelines to meet in order to operate a commercial motor vehicle, and if an unqualified truck driver is hired or continues to operate a large truck, this could create serious risk and dangers on the roadway. Moreover, this could help establish liability for a truck accident.
According to federal trucking regulations, a driver who is disqualified is not permitted to drive a commercial motor vehicle. This is true regardless if they previously drove a commercial vehicle. Moreover, a motor carrier cannot require or permit a driver who has been disqualified to drive a commercial vehicle even if the driver previously drove for the motor carrier.