The following situations: criminal escape, bad behavior, drug abuse, overdue credit card, unpaid debt being publicized by the court, etc. In the public security system, identity cards are divided into four colors: white, blue, yellow and red. White means everything is normal, blue means someone who has been investigated by the police station many times, yellow means some ex-criminals who take drugs and steal, and red means that this person is a fugitive or other special personnel.