Police out of the mission are to shoot video as evidence, this is the police department regulations, police check the room with a cell phone to shoot is the law enforcement record video, belong to the legal operation.
Police law enforcement process is mainly divided into four parts, first of all, there must be a perpetrator to report the case, and then the public security organs to review the facts in line with the case will be filed, and then send the police to investigate the case, and finally solve the case.