In this Jan. 31, 2017 photo, Denver marijuana grower Tim Cullen, left, shows young marijuana clones to out-of-state agriculture officials on a grow warehouse tour organized by the Colorado Department of Agriculture in Denver. Colorado's Agriculture Department is opening up its marijuana knowledge to other states and encouraging them to plan now for the possibility of regulating farmers growing a plant that violates federal law. (AP Photo/Kristen Wyatt)
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