Violent teens. Can physicians help?

In April, 15 suburban high school students were killed and more than 20 wounded in Littleton, Colorado, the victims of two violent adolescent boys. During the same week, another adolescent boy, Thomas Koskovich, was found guilty of capital murder in New Jersey's rural Sussex County. A week before that, in Toms River, teenager Sam Manzie, was sentenced to a lifetime in prison for the earlier senseless slaying of an even younger boy. For several years, we have been reading in newspapers and been watching on television other examples of teenage violence. Why?