Oklahoma officials revealed this week that a large-scale enforcement operation uncovered a significant number of illegal aliens driving commercial trucks with questionable or expired licenses. According to Public Safety Commissioner Tim Tipton, troopers and federal agents screened 520 commercial drivers over the course of the enforcement effort. The findings raise new concerns over how individuals without legal status are able to obtain commercial driver’s licenses (CDLs). Commercial driver’s licenses are considered among the most regulated credentials in the U.S., requiring strict testing and verification procedures. Stitt’s office said more enforcement actions are expected as Oklahoma moves to strengthen its oversight of commercial drivers entering the state.