What Were They Thinking?

School shootings like the one at Northern Illinois University are usually linked to a mental disorder of the gunman, whose anger, social isolation or desire for attention bursts into violence, experts told the ABC News Law & Justice Unit. Some of those experts recommend that schools make mental health a criterion for admissions, while others say steps as simple as locking classroom doors go a long way toward safer schools. And while media coverage no doubt prompts some "copycat" incidents,...Full Story