legal ground
Article 73 of the Rules of Criminal Procedure of the People's Procuratorate (Trial)
For a case put on file for investigation by a public security organ, under any of the following circumstances, the people's procuratorate may, in the stages of examination, arrest, prosecution and trial, retrieve the audio and video recordings of the public security organ interrogating the criminal suspect, and examine the legality of evidence collection and the authenticity of the confession of the criminal suspect and the defendant: (1) It is believed that there may be illegal evidence-obtaining acts such as extorting confessions by torture in interrogation activities; (2) A criminal suspect, defendant or defender claims that the confession of the criminal suspect or defendant was obtained illegally and provides relevant clues or materials; (3) The criminal suspect or defendant raises objections or recants the legality of interrogation activities, and provides relevant clues or materials; (4) The case is serious and complicated. The people's procuratorate directly accepts a case filed for investigation, and when the investigation department transfers it for examination, arrest and prosecution, it shall transfer the audio and video of interrogation together with the case file materials for examination.