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.
The questioning of witnesses can only be conducted by investigators. There shall be no less than two investigators. Investigators can go to the witness's unit or residence to question the witness, but they must produce the certificates of the public security organ or the people's procuratorate. Investigators may question the witness at his unit or residence, and when necessary, they may also notify the witness to testify at the people's procuratorate or the public security organ. The questioning of witnesses should be conducted separately. In order to ensure that witnesses provide evidence truthfully, when questioning witnesses, they should be informed of their legal responsibilities of providing evidence and testimony truthfully, intentionally perjury or concealing criminal evidence.
The interrogation record shall be handed over to the criminal suspect for verification. If there is no reading ability, it shall be read out to the criminal suspect. If there are omissions or errors in the record, the criminal suspect may make additions or corrections. The criminal suspect shall sign or seal his name after admitting that it is correct in the record.
Investigators should also sign the records. If a criminal suspect requests to write his own confession, it shall be allowed. When necessary, investigators may also ask the criminal suspect to write a confession in person.
Article 88 of the Criminal Procedure Law of People's Republic of China (PRC), after the people's procuratorate has examined and approved the arrest, it may interrogate the criminal suspect; In any of the following circumstances, the criminal suspect shall be interrogated:
(1) Having doubts about whether the conditions for arrest are met;
(2) The criminal suspect requests to make a face-to-face statement to the procurator;
(3) There may be major illegal acts in the investigation activities.
When examining and approving an arrest, the people's procuratorate may question witnesses and other participants in the proceedings and listen to the opinions of defense lawyers; If a defense lawyer makes a request, he shall listen to the opinions of the defense lawyer.