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In this Feb. 6, 2020, photo, a Clean Colorado highway sign sponsored by the Northern Lights Cannabis Co. is displayed on eastbound 6th Avenue west of Sheridan Blvd. in Denver. | Credit: AP by Andy Cross/The Denver Post

In this Feb. 6, 2020, photo, a Clean Colorado highway sign sponsored by the Northern Lights Cannabis Co. is displayed on eastbound 6th Avenue west of Sheridan Blvd. in Denver.

More Images From Pot Shops Turn to Highway Sponsor Signs Amid Strict Ad Rules