A West Virginia teenager has been arrested and charged with making terroristic threats against other students in his Cabell County high school. He's also been charged with stalking. According to authorities, the teen was keeping a "kill list" of people that he wanted to eliminate and had a letter threatening at least one individual on his phone.
Polygraph tests -- also called "lie detectors" -- have been around so long that they're a permanent part of the way American's picture law enforcement operations. In the movies and on television, the police can hook a suspect up to a polygraph machine and make a clean call about their guilt after just a few questions.