California has revoke 17,000 commercial driver’s licenses improperly issued to foreign drivers, about 2.5 percent of all commercial licenses in the state. Officers detained 51 illegal immigrants over the course of three days, including 21 drivers holding non-domiciled commercial driver licenses issued by California and New York. Mullin underscored the risks unqualified drivers pose when they are behind the wheel of large trucks. Last month, DHS and DOT announced a partnership in an effort to probe fraudulent and illegal practices at commercial driver license schools. Federal rules require commercial drivers to be capable of communicating sufficiently in English to understand highway signs, respond to law enforcement, and handle emergencies.