In 2003, when Terrence Graham was sixteen, he and three other teens attempted to rob a barbeque restaurant in Jacksonville, Florida. Though they left with no money, and no one was seriously injured, Terrence was sentenced to die in prison for his involvement in that crime.

As shocking as Terrence's sentence sounds, it is merely a symptom of contemporary American juvenile justice practices. In the United States, adolescents are routinely transferred out of juvenile court and into adult criminal court without any judicial oversight. Once in adult court, children can be sentenced without...