Who will be the first to inform the detention center to release people?

Warden. Generally, people released from detention centers will only inform the detainees one day in advance, but have no obligation to inform their families.

1. Detention center refers to a place where a criminal suspect suspected of a criminal offence is temporarily detained by a public security organ before a judicial decision is made by the court. Organs of criminal suspects who have been arrested and criminally detained according to law. If the remaining sentence of a criminal sentenced to fixed-term imprisonment is less than three months before delivery for execution, the detention center shall execute it on his behalf.

2. When a criminal suspect is taken to a detention center, it must be accompanied by an arrest warrant, a criminal detention certificate issued by a public security organ or a state security organ at or above the county level, or a certificate that a public security organ, a state security organ, a prison, a labor reform institution, a people's court or a people's procuratorate at or above the county level has pursued and escorted the criminal suspect and temporarily detained him. If there is no such certificate, or the record of the certificate is inconsistent with the actual situation, it will not be taken into custody.