The kid's probably a brat, but, given the facts presented, i.e.: that he exhaled albuterol in the teacher's face, the teacher's reaction seems hysterical. Did he stab her while exhaling, or what?
The idea that a boy, even a brat, should be held in juvenile detention, where he could be beaten and raped, for such a minor infraction sounds Draconian.
Again, please note that the "facts" are all presented by relatives of the student, none of whom actually witnessed the event. We really don't know what happened.