An anonymous reader writes: Education authorities in the Chinese city of Luoyang have introduced an invigilating drone [Chinese] into the exam room, monitoring teenagers taking the two-day ‘gaokao’ assessment. The anti-cheating bots have been designed to scupper some of the inventive and high-tech tricks used by an increasing number of students in the region, such as paper scanning glasses, bugged stationary and receiving radio feeds of the test answers via hidden earpieces or transmitters sewn into clothing. The new drone, created by a Chengdu-based tech firm, is designed to pick up on the radio signals given off by such transmitters – inaudible to human invigilators. If a transmission is detected, the machine identifies the source location and plots it on a tablet device. The tablet is also used to issue directional commands to the six-propeller drone which can travel up to 500 meters high and rotate 360 degrees to scan an entire room.