[caption id="attachment_8050" align="alignright" width="183"] Chief Mike Koval[/caption] In an interview last week, Madison, Wisconsin Police Chief Mike Koval called marijuana prohibition a failure and advocated regulating and taxing the substance in order to pay for treatment programs that focus on more dangerous drugs. The comments came during an interview with the State Journal Wednesday about data showing African Americans in Madison were arrested or cited for marijuana offenses at about 12 times…