As CA legalizes pot, laws collide at US checkpoints

As CA legalizes pot, laws collide at US checkpoints

In this Thursday, Dec. 14, 2017 photo, 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. California legalizes marijuana for recreational use Jan. 1 but that won't stop federal agents from seizing small amounts on busy freeways and backcountry highways. Possession will still be prohibited at eight Border Patrol checkpoints in California, a daily demonstration of state and federal law colliding. (AP Photo/Elliot Spagat)

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