Chinese education authorities are using high tech for the "Gaokao" exam,  the annual college entrance test that many believe could lead to lucrative jobs. High school students have reportedly been cheating by using wireless devices over the years. In 2017, exam centers used metal detectors, wireless detectors and even drones to deter cheating. 9.4 million students took the exam this year.If caught, cheaters can face up to 7 years in jail.