![A Border Patrol agent prepares a robot to explore an underground drainage pipe for signs of illegal activity by smugglers.](/sites/default/files/photo/64.%20Nogales%2C%20AZ-JD_0.jpg)
A Border Patrol agent prepares a robot to explore an underground drainage pipe for signs of illegal activity by smugglers.
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A Border Patrol agent prepares a robot to explore an underground drainage pipe for signs of illegal activity by smugglers.