Legal basis:
Article 206 of the Procedures for Handling Criminal Cases by Public Security Organs shall know the identities of witnesses and victims and the relationship among witnesses, criminal suspects and victims before interrogation. When inquiring, the witness and the victim shall be informed of the legal responsibility that they must truthfully provide evidence and testimony and intentionally commit perjury or conceal criminal evidence.
Investigators are not allowed to disclose the case or express their opinions on the case to witnesses and victims, and it is strictly forbidden to use illegal means such as violence or threats to question witnesses and victims.