Chinese education authorities have gone high-tech to catch cheaters as millions of high-school students take their "gaokao," the annual university entrance exam seen as key to landing a lucrative white-collar job.
So high are the stakes and so competitive is the exam that some students resort to cheating.
Over the years, students have used wireless cheating devices disguised as erasers, belts and watches. Some also use tiny earpieces to communicate with accomplices helping them outside the exam room.