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The Rio Grande Valley is a main battlefront in the war against illegal trafficking. Here, agents and officers of the Department of Homeland Security are on a mission to protect the communities that lie along one of the United States' prime trafficking corridors. In this episode of Border Wars, a search team races to rescue a mother and her son, abandoned by smugglers in the brush. Down by the river, agents investigate a family after a van full of marijuana is discovered outside their home.