Black Americans were nearly four times as likely as whites to be arrested on charges of marijuana possession in 2010, even though the two groups used the drug at similar rates, according to new federal data. http://www.nytimes.com/2013/06/04/us/marijuana-arrests-four-times-as-likely-for-blacks.html?ref=us  This disparity had grown steadily from a decade before, and in some states, including Iowa, Minnesota and Illinois, […]