Sinaloa , Gulf cartels battle for control of drug routes across U.S. border . Score: 6 U.S. is doubling number of agents at border , spending $ 700 million . Agents , analysts compare situation to '90s battle against Colombian cartels .
Sinaloa , Gulf cartels battle for control of drug routes across U.S. border . The turf war has spurred record death tolls with gunbattles , beheadings . U.S. is doubling number of agents at border , spending $ 700 million . Agents , analysts compare situation to '90s battle against Colombian cartels .