Bus drivers have a special license called a, "CDL", (Commercial Driver’s License). Applicants for a bus driver license must have a safe driving record with no criminal convictions, pass a special CDL physical, pass a pre-employment drug and alcohol test, have fingerprints taken for both State and Federal review, have a promise of employment from a school district or a contractor, and take a written test before obtaining a driving permit. The written test requires applicants to have knowledge of bus inspection, pupil safety, and braking procedures. Driver applicants are then required to have 30 hours of behind the wheel training, learn how to complete a pre-trip inspection, and take a driving test in the vehicle they will be using. Once all of this has been completed and the license has been issued, drivers are required to be part of yearly random drug and alcohol testing, a license review every six months, have a CDL physical every two years, and be fingerprinted every time their licenses are renewed.