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In this Monday, Oct. 30, 2017, photo, Luke Byerly tends to his 14-year-old beagle, Robbie, during a break at Byerly's job as a technician at a veterinary clinic in east Denver. Byerly is using CBD, a non-psychoactive component of marijuana, oil to treat the dog's arthritis. (AP Photo/David Zalubowski)

In this Monday, Oct. 30, 2017, photo, Luke Byerly tends to his 14-year-old beagle, Robbie, during a break at Byerly's job as a technician at a veterinary clinic in east Denver. Byerly is using CBD, a non-psychoactive component of marijuana, oil to treat the dog's arthritis. (AP Photo/David Zalubowski)

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