The detention center will issue a release certificate to the detainee, and he can be released with the release certificate.
If the detention period expires and the person is not released, the family can file a complaint with the procuratorate.
Legal link: Article 84 of the Criminal Procedure Law: Public security organs shall interrogate a detained person within twenty-four hours after detention. If it is found that the person should not be detained, he shall be released immediately and a release certificate shall be issued.
Article 97 The People's Court, the People's Procuratorate or the public security organ shall release, release on bail pending trial, lift residential surveillance or modify the compulsory measures against criminal suspects or defendants who have exceeded the statutory period of compulsory measures. . If the legal period for criminal suspects, defendants and their legal representatives, close relatives or defenders to take compulsory measures against the people's court, people's procuratorate or public security organs expires, they have the right to request the lifting of the compulsory measures.