http://norml.org/legal/item/colorado-legalization?category_id=1582
http://www.regulatemarijuana.org/s/regulate-marijuana-alcohol-act-2012
(3) Personal use of marijuana. NOTWITHSTANDING ANY OTHER PROVISION OF LAW, THE FOLLOWING ACTS ARE NOT UNLAWFUL AND SHALL NOT BE AN OFFENSE UNDER COLORADO LAW OR THE LAW OF ANY LOCALITY WITHIN COLORADO OR BE A BASIS FOR SEIZURE OR FORFEITURE OF ASSETS UNDER COLORADO LAW FOR PERSONS TWENTY-ONE YEARS OF AGE OR OLDER:
(a) POSSESSING, USING, DISPLAYING, PURCHASING, OR TRANSPORTING MARIJUANA ACCESSORIES OR ONE OUNCE OR LESS OF MARIJUANA.
(b) POSSESSING, GROWING, PROCESSING, OR TRANSPORTING NO MORE THAN SIX MARIJUANA PLANTS, WITH THREE OR FEWER BEING MATURE, FLOWERING PLANTS, AND POSSESSION OF THE MARIJUANA PRODUCED BY THE PLANTS ON THE PREMISES WHERE THE PLANTS WERE GROWN, PROVIDED THAT THE GROWING TAKES PLACE IN AN ENCLOSED, LOCKED SPACE, IS NOT CONDUCTED OPENLY OR PUBLICLY, AND IS NOT MADE AVAILABLE FOR SALE.
(c) TRANSFER OF ONE OUNCE OR LESS OF MARIJUANA WITHOUT REMUNERATION TO A PERSON WHO IS TWENTY-ONE YEARS OF AGE OR OLDER.
(d) CONSUMPTION OF MARIJUANA, PROVIDED THAT NOTHING IN THIS SECTION SHALL PERMIT CONSUMPTION THAT IS CONDUCTED OPENLY AND PUBLICLY OR IN A MANNER THAT ENDANGERS OTHERS.
(e) ASSISTING ANOTHER PERSON WHO IS TWENTY-ONE YEARS OF AGE OR OLDER IN ANY OF THE ACTS DESCRIBED IN PARAGRAPHS (a) THROUGH (d) OF THIS SUBSECTION.
