Sinaloa , Gulf cartels battle for control of drug trade across U.S. border . The drug war has seen record death tolls with gunbattles , arrests . He has deployed about 30,000 troops to back up and , in some cases , do the job of local police . U.S. is increasing number of agents at risk , spending $ 700 million . Agents , analysts compare ' to ' the battle against Colombian cartels .
Sinaloa , Gulf cartels battle for control of drug trade across U.S. border . The drug war has seen record death tolls with gunbattles , arrests . U.S. is increasing number of agents at risk , spending $ 700 million . Agents , analysts compare ' to ' the battle against Colombian cartels .