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In Nogales, Ariz., agents set up a trap in “The Jungle,” an area of the desert that has become a smuggling expressway despite its perilous terrain. And with cartels increasingly sending fast-running juveniles and other “expendable” manpower, the agents are outnumbered. Downtown, Border Patrol and ICE agents discover a major drug-running tunnel and suspected smugglers may still be inside. Later, a young mother is caught with 54 bundles of marijuana in her gas tank.