Mental Illness and the Threat of Violence in America

During five disruptions in classrooms and libraries, Jared Loughner frightened teachers and classmates at Pima College. Police were used to deliver a letter telling him he couldn't come back unless he got "mental health clearance" indicating he was not "a danger to himself or others." In the aftermath of Saturday's shooting, did the college drop the ball? Could intervention have prevented the tragedy that has gripped the nation?