Colorado could be sealing any past marijuana convictions that Amendment 64 would have rendered impotent. If Senate Bill 218 is passed, Coloradans could petition to have their previous marijuana-related convictions sealed if they would have not been crimes under current Colorado law. The bill has bipartisan support and was announced Tuesday, April 29. The proposed bill comes with only a few days left in the 2014 session, but its impact could be huge, possibly giving thousands of residents the right…