1. Article 197 of the Procedures for Handling Criminal Cases by Public Security Organs stipulates that the interrogation of criminal suspects must be conducted by investigators. During interrogation, there shall be no fewer than two investigators.
Interrogation of criminal suspects in the same case shall be conducted individually.
Article 40 of the Procedures for Handling Criminal Cases by Public Security Organs stipulates that when investigating and collecting evidence, there shall be no fewer than two people's policemen, and they shall show their law enforcement status.