Major crimes that juveniles have commit are: first degree murder, second degree murder, sexual harassment and rape which have made juveniles getting sent to adult prisons quite easily and especially if the crime was done by a homicidal juvenile. A quote that says, "old enough to do the crime, old enough to do the time" (from a law school in Vanderbilt) which means that if you able to do the crime at your age then you are to take the punishment ahead that comes with it.
Although if the teen isn't old enough the court will