Colorado plans to crack down on medical marijuana patients and medical pot growers with permission for more than six plants.
The head of the state Health Department announced Friday that those so-called "high volume" patients and their designated caregivers to show physician justification for "medical necessity" waivers.
Colorado is considering a crackdown on medical marijuana patients and growers now that the drug is legal for all over 21.
The state Health Department oversees the medical marijuana registry, which had about 110,000 patients at the end of January.
Colorado's pot-legalization measure approved in 2012 did not dismantle the medical registry. The Health Department is seeking a bill to crack down on high-volume marijuana growers in the medical system, saying they should be considered commercial growers.