Yes you never know how a kid will turn out, and you cant control anyone's behavior. Even a good kid every now and then flips out and does something bad. My point was to find a way to punish schools where there is a reocurring pattern, which would suggest they know they are recruiting bad apples, but they look the other way.
Every year we hear of crimes being committed, and the nature of the crime suggests that it probably wasn't the offender's first criminal act. I'm not talking about smoking weed, but rather violent crimes that tell you the offender has some disturbing character traits.