The Supreme Court says it's unconstitutional for states to pass laws automatically sentencing juveniles to life in prison without parole for murder.
Monday's 5-4 decision is in line with others the court has made, including ruling out the death penalty for juveniles and life without parole for young people whose crimes did not involve killing.
The decision came in the robbery and murder cases of Evan Miller and Kuntrell Jackson, who were 14 when they were convicted.
Miller was convicted of killing a man in Alabama. Jackson was convicted of being an accomplice in an Arkansas robbery that ended in murder.
Do you agree with the decision? Or do you think states should be able to get tough on kids who commit adult crimes?
Comment below or e-mail us at email@example.com.