China surveillance of journalists to use 'traffic-light' systemChina surveillance of journalists to use 'traffic-light' system External linkThe Chinese province of Henan is building a surveillance system with face-scanning technology that can detect journalists and other "people of concern". Documents seen by BBC News describe a system that classifies journalists into a "traffic-light" system - green, amber and red.TagschinafreedomjournalismsurveillanceContent typeLINK