For years Illinois law enforcement officials have used lidar guns to catch speeders on Illinois highways. Lidar is different from radar in that it uses light waves instead of radio waves. The Chicago Tribune is reporting that many speeding tickets in which the officer used lidar are being thrown out because the science behind the technology has not been legally established in court with a Frye hearing. The Cook County judges' opinions are not uniformly shared across the state, but it is certainly worth exploring before simply pleading guilty the next time you get a speeding ticket. You can read the full text of the Tribune article here.