A series of Supreme Court decisions that limit the punishments available for children who commit the most serious crimes. Beginning in 2005, the Supreme Court prohibited death sentences for crimes committed as children, then life-without-parole sentences for non-homicide crimes, then said even homicide crimes can only get life without parole in the "rarest" of circumstances. The overarching idea is, kids are different, and less deserving of the harshest punishments, because their brains are not yet developed and they have better hopes of rehabilitation and change.