This isn't about the legalization of marijuana in the U.S. State of Colorado. Its about the behavior of banks and credit card companies with respect to purchases or related transactions. Buried in an CBCNews article is found:
Despite their concerns, the state has collected some $60 million US in pot tax revenue since passing the amendment. Last month, Hancock spent $4 million on new programs for the city.
But because legalization remains illegal on the federal level, most major banks are reluctant to handle the money marijuana dispensaries bring in and businesses are unable to use credit or debit cards. (source)
But because legalization remains illegal on the federal level, most major banks are reluctant to handle the money marijuana dispensaries bring in and businesses are unable to use credit or debit cards. (source)