See Evil, Hear Evil, Speak Evil.

• Position: Teen informers help prevent school violence - Brief Article

Silence can be deadly. By speaking up, teen informers may have averted four separate Columbine-style school attacks.

At high schools in Colorado, New York, and Kansas, and at a college in California, students recently tipped off authorities after learning about fellow teens stockpiling weapons and planning massacres. "When I thought these guys could kill my friends, and even themselves, I knew I couldn't live with myself if anything happened," says a girl in Fort Collins, Colorado, who had heard talk of a re-enactment of the Columbine shooting being planned for its second anniversary in April.

Experts say that in almost three-fourths of the 37 school...