"More and more often cloned vehicles have been appearing in illegal operations. As time passes, the vehicles have become increasingly popular to criminals. The vehicles are copied so well it is often very difficult to tell them apart from the real thing. The smugglers are using school buses, tractor trailers, delivery trucks and vans, even emergency vehicles and federal agency look-a-likes to accomplish their mission. This document will provide you with some specific examples of cloned vehicles used and confiscated in the past, along with tips to utilize in order to spot these forgeries in the future. If these tactics continue to prove successful, terrorist and extremist organizations will no doubt begin employing them during attack scenarios."
Surface Transportation Information Sharing and Analysis Center: http://www.surfacetransportationisac.org/reference.asp