When Colorado voters passed the law that decriminalized marijuana, the voters approved using tax money generated from marijuana sales for schools, police, and drug education. However, the tax money might end up not being used for any of those programs. The Taxpayer's Bill of Rights restrains the state's ability to tax and spend. As of April 2015, projections for marijuana tax revenue for Colorado are at $58 million. But that money might have to be returned to taxpayers, due to the provisions in the state's Taxpayer Bill of Rights.