Legal basis: Criminal Procedure Law of People's Republic of China (PRC).
Article 118 The interrogation of a criminal suspect must be conducted by investigators of a people's procuratorate or a public security organ. During interrogation, there shall be no fewer than two investigators. After the criminal suspect is sent to the detention center for custody, the investigators shall interrogate him in the detention center.
Article 123 Investigators may record or video the interrogation process when interrogating a criminal suspect. For cases that may be sentenced to life imprisonment or death penalty or other major criminal cases, the interrogation process shall be recorded or videotaped. Audio or video recording should run through the whole process and remain intact.