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Along the Arizona-Mexico border, the battlefront is changing for the officers and agents of the Department of Homeland Security as tougher security pushes cartels to devise new strategies and move their traffic through the most extreme terrain. In this episode of Border Wars, the Blackhawk crew helps track suspects in one of America's most dangerous national park. On the ground, agents hunt for and recover large marijuana bundles stashed in the brush. Meantime, some smugglers have switched fro