The U.S. punishment system is in turmoil. We have a historically unprecedented number of offenders in prison, and our prisoners are serving longer sentences than in any other country. States are surreptitiously experimenting with formulas for lethal injection cocktails, and some prisoners are suffering from botched executions. Despite this tumult, the Eighth Amendment of our Constitution does place limits on the punishments that may be imposed and how they may be implemented. The difficulty, though, is that the Supreme Court’s Eighth Amendment jurisprudence is a bit of a mess. The Court has been consistent in stating that a focus on offender dignity is at the core of the Amendment’s prohibition on cruel and unusual punishments, but there ha...