Cheating on university entrance exams has been a major problem in China recently, so authorities have created new systems to try to stop students from cheating. Every year, millions of students across the country gather in large halls to take the test. At most test sites across China, students must pass through airport-style metal detectors to make sure they are not bringing in any electronic devices, including watches. Cameras have also been installed at test locations, broadcasting the testing to the offices of top local education officials. In some areas, hundreds of police are called in to patrol the testing.