Because according to the provisions of the Law on Public Security Administration Punishment, the time for interrogation and verification of the perpetrator who may be punished by administrative detention shall not exceed 24 hours; According to the provisions of the Police Law, you can apply for continued questioning for up to 48 hours.
Public security administration punishment law
Article 83 After being summoned, the public security organ shall promptly inquire and verify the person who violates the administration of public security, and the time for inquiry and verification shall not exceed eight hours. If the situation is complicated and the punishment of administrative detention can be applied according to the provisions of this law, the time for questioning and verification shall not exceed 24 hours.
Police law
Article 9 In order to maintain public order, the people's police of the public security organ may interrogate and inspect the persons suspected of violating the law and committing crimes on the spot upon showing the corresponding certificates; After cross-examination and inspection, in any of the following circumstances, with the approval of the public security organ, it may be taken to the public security organ for further cross-examination:
(1) Accused of a criminal act;
(2) Being suspected of committing a crime on the spot;
(3) Having an unidentified suspect;
(4) The articles carried may be stolen goods.
The detention time shall not exceed 24 hours from the time when the interrogated person is taken to the public security organ. Under special circumstances, with the approval of the public security organ at or above the county level, it may be extended to 48 hours, and the interrogation record shall be kept. If the cross-examination is approved to continue, it shall immediately notify the family members or the unit to which it belongs. If the interrogation is not approved, the interrogated person shall be released immediately.
If the public security organ considers it necessary to take detention or other compulsory measures against the interrogated person according to law after continuing the interrogation, it shall make a decision within the time limit specified in the preceding paragraph; If the above decision cannot be made within the time limit specified in the preceding paragraph, the interrogated person shall be released immediately.