Link please? Because I see no reason that illegal sales would not go up.
English
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Ease of access (legal) > purchasing non-taxed marijuana (illegal) https://www.drugpolicy.org/sites/default/files/Colorado_Marijuana_Legalization_One_Year_Status_Report.pdf
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It was decriminalized (mostly) in 2010 to a misdemeanor, and the statistics on that page only count arrested people so I'm not surprised that a huge decrease came with it. That page didn't help anyone here. Got anything else?