Numerous studies have shown that children who are identified as 'bullies' at school are much more likely than others to engage in delinquent and criminal behaviours as adults.
In a recent study, criminologists Ttofi, Farrington and Lösel (2012) examined 18 studies conducted worldwide in which children identified as bullies and non-bullies at school were compared with respect to their subsequent criminal behaviour. Evidence of criminal behaviour was derived from official records of arrest or police/court contact and also self-reports of shoplifting, theft, vandalism, property damage and violent offending.
The authors concluded that 'school bullying is a strong and specific risk factor for later offending' and 'effective anti-bullying programmes should be promoted, and could be viewed as a form of early crime prevention.'