A Mexican federal policeman patrols a highway south of Nuevo Laredo in Mexico in this June 17, 2005 file photo. Once an easygoing Mexican border town thronging with U.S. tourists, Nuevo Laredo is becoming a ghost town because of a brutal, three-year-old turf war between rival drug cartels that has driven residents and businesses across the Rio Grande to the safety and prosperity of its Texan sister city, Laredo. To match feature MEXICO-DRUGS/GHOSTTOWN