Mandatory Sentencing in the War on Drugs

Federal laws passed in the 1980's provided the same prison sentence for dealing in five grams of crack cocaine as for 500 grams of powder, a ratio of 100-to-1. But it turned out that the so-called "crack epidemic" never happened, and the Journal of the American Medical Association now says that crack is not more addictive than powder or more likely to lead to violence after all. But crack is used more often by African Americans, which means that federal prisons are crowded with black prisoners doing more time than whites for essentially the same crimes. Two weeks ago, the House and the Senate allowed new guidelines that make sentences for crack commensurate with those for powder cocaine. Should the change be made retroactive?  Would 20,000 criminals be released all at once?  We'll hear about the ongoing debate at the US Sentencing Commission.