Mandated by the Commercial Motor Vehicle Safety Act 1986 (CMVSA) and revised in accordance with various other federal laws subsequent to CMVSA, CDLIS helps document the issuance of a Commercial driver's license (CDL) and the withdrawal of a commercial driver by the State Driver Licensing Agencies (SDLAs) of the CDLIS jurisdictions (the 50 U.S. States and the District of Columbia). The purpose of CDLIS is to keep a record of each driver nationwide and help ensure only one driver license and one record for each driver and to enable authorized users nationwide, such as local law enforcement officials, to check whether a driver is withdrawn, through the cooperative exchange of commercial driver information between the CDLIS jurisdictions.