“Teenagers make mistakes. They sneak out past curfew to drink at a house party, shoplift clothes, graffiti their names in bathroom stalls, talk back to authorities and throw punches in heated moments. Our juvenile justice system views some of these violations as youthful folly; others are deemed criminal offenses. Unjustly, skin color or socioeconomic status might determine how the behavior is categorized. Suburban white youth are tsk-tsked, while urban black children are handcuffed and jailed.”