U.S. Customs and Border Patrol agents and K-9 security dogs keep watch at a checkpoint station, on Feb. 22, 2013, in Falfurrias, Texas. (Associated Press) **FILE**
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U.S. Customs and Border Patrol agents and K-9 security dogs keep watch at a checkpoint station, on Feb. 22, 2013, in Falfurrias, Texas. (Associated Press) **FILE**
