Caregivers are people authorized by the state to grow marijuana on behalf of others, and they're not subject to state taxes or background checks.
The vote is largely symbolic since Treasury already had gone ahead with the guidance, but it demonstrates a loosening of anti-marijuana sentiment on Capitol Hill.
Sales of recreational marijuana in Colorado dropped for the first time in May after rising every month since stores opened in January.
Colorado's Department of Revenue completes first market demand study since retail sales began in January.
CNN’s Dr. Sanjay Gupta made the treatment -- called “Charlotte’s Web" -- famous in his film “Weed.” But Colorado’s top public health doctor questions its safety.
The victims of hash oil manufacturing fires may have severe burns, cope with high medical bills, loss of job and home.
Tom Bollich cofounded the online gaming company Zynga. Now in Colorado, his story shows the evolution of the pot economy.
Colorado marijuana regulators looking to tighten the rules for edible marijuana products are pondering scaled testing regimes for strong edibles and weaker ones.
Governor John Hickenlooper is no fan of legal marijuana, but he says so far he's not too worried about the drug's impact on Colorado's image.