Legal analysis: 1) The subject of case investigation must be the public security organ and its people's police who have the right to investigate and deal with public security cases according to law. (2) The investigation procedure must comply with the law. For example, summoning offenders must be carried out in accordance with the summoning procedures stipulated in this law. For example, if you want to show your inspection certificate, there should be no less than two people's policemen during the inspection, and the interrogation record should be submitted to me for verification. After my signature or seal, I assign or hire experts to carry out appraisal, and the investigators withdraw. The evidence obtained through investigation must conform to the form prescribed by law. (4) It is forbidden to extort confessions by torture or collect evidence by threats, enticements, deception or other illegal means.

Legal basis: Article 79 of People's Republic of China (PRC) Public Security Administration Punishment Law, public security organs and their people's police investigate public security cases according to law.

It is strictly forbidden to extort confessions by torture or collect evidence by threats, enticements, deception and other illegal means.