![Photo of a Border Patrol agent checking the steel gates in Nogales' main drainage system](/sites/default/files/photo/112.%20Nogales%2C%20AZ-JD_0.jpg)
A Border Patrol agent looks through the steel gates in Nogales' main drainage system, which were built to prevent drug and human trafficking.
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A Border Patrol agent looks through the steel gates in Nogales' main drainage system, which were built to prevent drug and human trafficking.