“More than 20 years ago, the late Chief Justice of the United States William Rehnquist leveled strong criticism against mandatory minimum sentences for drug crimes. He called them ineffective, expensive, and unduly harsh for minor offenders – and he was right. The Chief Justice also understood why these laws gained approval, noting, ‘Mandatory minimums…are frequently the result of floor amendments to demonstrate emphatically that legislators want to ‘get tough on crime.’”