The National School Safety Center says that while there's no sure way to know if a person is potentially dangerous, this list provides a good starting point
Has a history of tantrums and uncontrollable angry outbursts.
Characteristically resorts to name calling, cursing or abusive language.
Habitually makes violent threats when angry.
Has previously brought a weapon to school.
Has a background of serious disciplinary problems at school and in the community.
Has a background of drug, alcohol or other substance abuse or dependency.
Is on the fringe of his/her peer group with few or no close friends.
Is preoccupied with weapons, explosives or other incendiary devices.
Has previously been truant, suspended or expelled from school.
Displays cruelty to animals.
Has little or no supervision and support from parents or a caring adult.
Has witnessed or been a victim of abuse or neglect in the home.
Has been bullied and/or bullies or intimidates peers or younger children.
Tends to blame others for difficulties and problems s/he causes her/himself.
Consistently prefers TV shows, movies or music expressing violent themes and acts.
Prefers reading materials dealing with violent themes, rituals and abuse.
Reflects anger, frustration and the dark side of life in essays or writing projects.
Is involved with a gang or an antisocial group on the fringe of peer acceptance.
Is often depressed and/or has significant mood swings.
Has threatened or attempted suicide
