Legal analysis: Public security detention requires a detention permit, which is issued by the public security organ. When the case-handling personnel of the public security organ think it necessary to detain the criminal suspect, they shall fill in the Report on Detention by Letters and Visits, indicate the relevant information and reasons, and issue a detention permit after being reviewed by the department leaders and approved by the person in charge of the public security organ.

Legal basis: Provisions on Procedures of Public Security Organs Handling Criminal Cases

Article 79 The public security organ shall summon the criminal suspect by force and order him to sign the detention certificate and press his fingerprint.

After the criminal suspect arrives at the case, he shall be ordered to fill in the time of the case on the detention certificate; After the detention is over, the detention end time shall be filled in the detention certificate. If the criminal suspect refuses to fill it out, the investigator shall indicate it on the detention certificate.

Article 125 To detain a criminal suspect, a detention application report shall be filled out and a detention permit shall be made with the approval of the person in charge of the public security organ at or above the county level. When carrying out detention, you must show your detention certificate, and order the detainee to sign the detention certificate and press his fingerprint. If the detainee refuses to sign or fingerprint, the investigator should indicate it.

In case of emergency, if one of the circumstances listed in Article 124 of these Provisions is met, the criminal suspect may be verbally summoned to the public security organ for immediate examination and legal procedures upon production of the people's police card.