Legal analysis: The maximum period of seizure and detention is 30 days.

Legal basis: "Criminal Procedural Law of the People's Republic of China"

Article 141 What is discovered during investigation activities can be used to prove the guilt of the criminal suspect or All kinds of property and documents that are not related to the case must be sealed up and detained; property and documents that are not related to the case must not be sealed up or detained.

Seized and seized property and documents must be properly kept or sealed and must not be used, exchanged or destroyed.

Article 142: The property and documents that have been seized or seized shall be clearly checked together with the witnesses present and the holders of the property and documents that were seized or seized, and a list shall be made in duplicate on the spot. It shall be signed or stamped by the investigators, witnesses and the holder. One copy shall be given to the holder and the other shall be attached to the file for reference.

Article 143: When investigators believe that it is necessary to seize a criminal suspect’s mail or telegrams, they may, with the approval of the public security organ or the People’s Procuratorate, notify the postal and telecommunications authorities to seize the relevant mail or telegrams. Handed over to seizure.

When it is no longer necessary to continue to detain, the postal and telecommunications authorities should be notified immediately.