Medical Marijuana Dispensaries Colorado 2000-2009 CDIA / Rocky Mountain HIDTA http://www.cdiausa.org/ Dispensary Colorado voters pass Amendment 20 Medical Use of Marijuana Amendment 20 Medical Use of Marijuana Takes Effect 2001 Only a handful of Medical Marijuana Dispensaries Exist between 2002 and 2006 Less than 10 Medical Marijuana Dispensaries Exist between 2006 and 2007 Less than 20 Medical Marijuana Dispensaries Exist between 2006 and 2007 More than 45 Medical Marijuana Dispensaries in the Denver Metro late 2009 2000 2001 2002 2003 2004 2005 2006 2007 2008 2009