Status: Legal History: 1917: cannabis prohibited in Colorado 2000: Medical cannabis legalised (approval by a doctor, with a qualifying condition. Dispensary system with allowance for home cultivation) 2012: Recreational use legalised 2013: Sales began in September Policy Framework: Only people 21-years-of-age or older can possess, purchase or consume cannabis; Possession is limited to 1oz (28g) at a time per adult; Public use is illegal; Driving under the influence is illegal; Excise tax of 15% applies to all cannabis-containing products; Adults over 21 can give up to an ounce of cannabis to another adult but cannot sell it; Minor packaging requirements - resealable and not transparent, must have required symbol on the package; 10% sales tax applies to all cannabis-containing products on top of Colorado’s standard 2.9% sales tax; Only licensed retailers can sell cannabis; Possession of more than 1oz of cannabis is a petty offense (like a speeding ticket) punishable by a fine of up to $US100; Possession of more than 2oz (56g) of cannabis is a misdemeanour punishable by up to 18 months in prison and fines of up to $US5000; Possession of more than 12oz (340g) of cannabis is a felony punishable by up to two years in prison and fines of up to $US100,000; Unlicensed distribution with remuneration or more than 1oz is a misdemeanour punishable by up to 18 months in prison and fines of up to $US5000; Unlicensed distribution of more than 6oz (170g) is a felony punishable by up to 32 years in prison and fines of up to $US1,000,000; Cultivation of more than six plants is a felony punishable by up to six years in prison and fines of up to $US500,000; Sources: Norml, Colorado Department of Health and the Environment Outcomes: Youth marijuana use increased by 20% between 2013 and 2014, while usage among adults increased by 17% during the same period; According to the Department of Revenue, the Colorado marijuana tax brought in about $US302 million in 2019; Total cannabis sales across the state rose from $US699.2 million in 2014 to $US1.51 billion in 2017; Data from the Bureau of Economic Analysis shows Colorado's GDP increased by roughly $US41 billion since legalisation; Visits to emergency room related to cannabis increase; Car crash rate increase, but no increase in fatalities; $US1.55 billion in sales, 98% of which were purchased for recreational use; Rate of 12-17-year-olds using cannabis is the lowest it has been since 2008; The number of drivers involved in fatal crashes who were tested above the level of impairment limit decreased from 52 to 35; Organised crime rates have tripled in five years; Between 2005 and 2017, cannabis use disorder in people over the age of 12 increased from 1.7% to 2.3%. Read more