On August 3, 2010, President Barack Obama "signed an historic piece of legislation that narrows the crack and powder cocaine sentencing disparity from 100:1 to 18:1 and for the first time eliminates the mandatory minimum sentence for simple possession of crack cocaine."
Source
American Civil Liberties Union, "President Obama Signs Bill Reducing Cocaine Sentencing Disparity," August 3, 2010, last accessed July 26, 2016.