can prior discipline show a pattern of behavior
Prior aggressive behavior may have been directed at persons or expressed through cruelty to animals, firesetting, lying, vandalism, or other antisocial acts. Research suggests that age of onset may be a key factor in interpreting early warning signs. Students who engage in aggression and drug abuse at an early ageâbefore age twelveâare more likely to show violence later on than are students who begin such behavior at a later age.