2. Article 122 of the Criminal Procedure Law of People's Republic of China (PRC): Investigators may question witnesses on the spot, or at the unit, residence or place proposed by the witness, and when necessary, they may notify the witness to testify in the people's procuratorate or public security organ. When questioning witnesses on the spot, they should show their work certificates, and when questioning witnesses at their units, residences or places proposed by witnesses, they should show their certificates from people's procuratorates or public security organs.
3. Article 270 of the Criminal Procedure Law of People's Republic of China (PRC) shall notify the legal representatives of juvenile criminal suspects and defendants to be present when interrogating or trying juvenile criminal cases. If it is impossible to notify, the legal representative cannot be present, or the legal representative commits a crime of * * *, other adult relatives of the juvenile suspect or defendant, and representatives of the school, unit, grass-roots organization or minor protection organization in the place of residence can also be notified to be present, and relevant information can be recorded. The legal representative present may exercise the litigation rights of juvenile criminal suspects and defendants on his behalf.
If the legal representative or other persons present believe that the case-handling personnel have infringed upon the legitimate rights and interests of minors during interrogation and trial, they may make comments. The interrogation record and the court record shall be handed over to the legal representative or other persons present for reading or reading.
When interrogating female juvenile criminal suspects, there should be female staff present.
In the trial of juvenile criminal cases, after the juvenile defendant makes his final statement, his legal representative may make supplementary statements.
The provisions of paragraphs 1, 2 and 3 shall apply to the questioning of juvenile victims and witnesses.
4. To sum up, the conditions in "2" are met, that is, the witness can be contacted by showing relevant procedures. If the witness is a minor, the conditions in "3" should be met. Of course, if threats are involved in the contact process, the situation of luring witnesses is another matter. Of course, the evidence obtained in this way is also invalid. See the Criminal Procedure Law for details.
5. References: People's Republic of China (PRC) Criminal Procedure Law.