Article 166 of the Procedures for Handling Criminal Cases by Public Security Organs stipulates that if a public security organ receives a citizen's abduction, report, complaint or report or a criminal suspect voluntarily surrenders himself, it shall immediately accept it, inquire about the situation and make a record. After verification, the abductor, informant, accuser, informant and surrender shall sign and press the fingerprint. When necessary, audio or video recordings shall be made.
Article 167. The public security organ shall register the relevant evidential materials provided by the abductor, informant, accuser, informant and surrender, and make a list of accepted evidential materials, which shall be signed by the abductor, informant, accuser, informant and surrender. When necessary, photographs shall be taken or audio or video recordings shall be made, and they shall be properly kept.
Article 175 After accepting a case, the public security organ shall, after examination, consider that the criminal facts that need to be investigated for criminal responsibility belong to its own jurisdiction, and file a case with the approval of the person in charge of the public security organ at or above the county level; If it is considered that there are no criminal facts, or the criminal facts are obviously minor and need not be investigated for criminal responsibility, or there are other circumstances in which criminal responsibility is not investigated according to law, the case shall not be filed with the approval of the person in charge of the public security organ at or above the county level.
If a complainant decides not to file a case, the public security organ shall make a notice of not filing a case and serve it on the complainant within three days.
Article 187. The public security organ shall promptly investigate the criminal cases that have been put on file, and comprehensively and objectively collect and obtain the evidence of the criminal suspect's guilt or innocence, and the crime is light or heavy.