We're sad and angry that it makes sense to repost this episode - on mass shootings / FROM THE ARCHIVE

Four more have been murdered by a teen with an assault-style rifle - many more were injured - at Apalachee High School in Winder, GA. Still, this episode gives us a glimmer of hope: specialists in “behavioral threat assessment” have been quietly trying to spot potential killers for decades, in places from schools and companies to government agencies - and the latest carnage could probably have been avoided if authorities had followed their manual. Our guests, practitioners Monique Boudreaux and Matt Talbot, say everybody in America needs to help them instead of looking the other way.