FILE - Border patrol agents use a drug sniffing dog to check vehicles at California's Pine Valley checkpoint, on the main route from Arizona to San Diego, Dec. 14, 2017 (AP Photo/Elliot Spagat, File)
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FILE - Border patrol agents use a drug sniffing dog to check vehicles at California's Pine Valley checkpoint, on the main route from Arizona to San Diego, Dec. 14, 2017 (AP Photo/Elliot Spagat, File)
