An article in Science Daily reports success with behavioral techniques to curb aggressive behavior in children:
In the "Good Behavior Game" students motivate their teammates to follow class rules and are rewarded with incentives like a little extra time at recess or verbal praise from the teacher. Rather than separating children who are disruptive from the rest of the class, Dr. Brown said, the teacher draws on the powerful influence of a students' peers to collectively reinforce positive behavior.
"The intervention also was effective over the long term for the boys at highest risk -- their rate of aggression was much lower in middle school, and even as far as young adulthood 14 years later," said Dr. Brown, a professor of epidemiology and biostatistics whose research focuses on preventing mental health problems in youth. "Their rates of criminal activity, delinquency and antisocial behaviors were much lower compared to aggressive boys who did not receive the intervention … The Good Behavior Game also increases the likelihood that these high-risk males will complete high school.