All of the efforts that police officers devote to reducing needless highway deaths and serious injuries resulting from traffic crashes and impaired driving bring them into contact with myriad citizens, some of whom use vehicles to commit non–traffic-related criminal acts. According to a Bureau of Justice Statistics report, being a driver during a traffic stop was the most common reason in 2005 for a face-to-face police contact; it accounted for about 40 percent of an estimated 43.5 million police contacts of U.S. residents aged 16 years or older.¹ Traffic stops afford alert police officers additional legitimate opportunities to detect crime and apprehend perpetrators. The IACP Highway Safety Committee and the 3M Traffic Safety Systems Division, recognizing the vital role that license plates play in crime detection, have partnered for more than a decade in recognizing police officers who use license plates to solve serious, nontraffic crimes.