Bossier Parish is using license plate readers to crack down on uninsured drivers. Authorities have been testing four cameras along Louisiana Highways 2 and 3 in the northern part of the parish. The plan is to install 40 more at undisclosed intersections in the parish in the next four to six months. The readers also could prove valuable when Amber Alerts are issued and other criminal activity occurs, Sheriff Julian Whittington said. "These are not red light cameras."