I urge you to consider commuting the federal prison sentence of Clarence Aaron, whose case highlights the unjust consequences of federal minimum-sentencing laws, and the vengeful rather than rehabilitative nature of the US prison system. Fox News in December reported on the case of Mr Aaron, a university student and a good citizen who was convicted a decade and a half ago of conspiracy to distribute cocaine. His conviction stems only from the fact that, as a student struggling to pay tuition fees, he accepted money in return for introducing a friend to a drug dealer. Although others involved in the crime received lenient sentences in exchange for testifying against Mr Aaron, Mr Aaron himself was sentenced to three life sentences without the possibility of parole. (One year later, Congress passed a "safety valve" exempting first-time, non-violent offenders from mandatory minimum sentences, but the law was not retroactive.) It is unethical to keep Mr Aaron imprisoned: his continued incarceration does nothing towards his rehabilitation, and people who were guilty of more serious crimes have received much lesser sentences. I urge you to commute Mr Aaron's sentence, and those of all prisoners who similarly have run afoul of mandatory minimum sentencing laws, so that they will be immediately able to rejoin society as productive citizens.