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Border Patrol agents cut off a getaway car as it tries to flee the scene of a drug drop in ranchland east of Nogales, Ariz. Agents arrest the driver and seize the drugs, then pursue the smugglers. At night on the western edge of Nogales, agents pursue and capture a group of illegal immigrants guided by a potential professional human smuggler. And in Douglas, Ariz., Immigration and Customs Enforcement agents join with Border Patrol experts to search a tunnel hidden inside a suburban border house.