Article 28 of the Procedures for Handling Administrative Cases by Public Security Organs requires obtaining evidence from relevant units and individuals, and shall be approved by the person in charge of the case-handling department of the public security organ and issue a notice of obtaining evidence. The transferee shall affix his seal or signature to the notice. If the transferee refuses, the public security organ shall indicate it. When necessary, the public security organ shall fix the content of evidence and the process of obtaining evidence by means of audio and video recording.

The evidence obtained by the public security organ has physical evidence; Written evidence; The statement of the victim and the testimony of other witnesses; Statements and defenses of the illegal suspect; Appraisal opinions; Records of inquest, inspection, appraisal and on-site record; Audio-visual materials, electronic data.