Legal basis: Provisions on the Procedures for Handling Criminal Cases by Public Security Organs Article 168 When accepting a case, a public security organ shall make a registration form for accepting the case and issue a receipt. It is not necessary for the police to file a case with the consent of the informant, because the police have the right to file a case and accept it, strengthen investigation, and so on. First of all, we need to be clear about the specific issues of filing an investigation. If you need the signature of the informant or the specific requirements for filing a case, you can consult the professional lawyer of Hualu. Solve your doubts online.