A portion of the taxes collected from adult retail marijuana sales in Colorado is earmarked for schools under the law, and the amount collected so far this year is already more than was collected in all of 2014. The Denver Post reports: In the first five months of 2015, the state’s pot-funded excise tax that collects money earmarked for school construction capital brought in more money than it did in all of 2014. While that specific school tax’s 2015 take may not reach the $40 million number used…