The criminal justice system in America is crumbling as untold millions of dollars are wasted; waning confidence in the credibility of the system erodes our fragile democracy; and countless lives are ruined not just by crime but by our faulty responses to crime. And yet most of the basic principles of our system of criminal justice pass muster on the closest scrutiny and in fact have been copied across the world. There is, clearly, a gap between justice-in-principle and justice-in-real-life. This is a chasm very hard to leap across...