Lexington High School put on high alert after student threat
[gtxvideo vid="4QNUHfG4" playlist="" pid="OTSe9U1y" thumb="http://player.gtxcel.com/thumbs/4QNUHfG4.jpg" vtitle="HS Kid Missing PKG”] HENDERSON COUNTY, Tenn. -- Lexington High School is put on high alert Friday after a student makes a threat against the entire school. "It's horrifying. It's scary to think about all…