(1) Inquiry. Inquiry means that law enforcement agencies or lawyers ask the parties, witnesses or expert witnesses to state their understanding of the case. Inquiry is a measure and method often used in any case. (ii) interrogation. Interrogation refers to the act of law enforcement agencies asking the violator, criminal suspect or criminal defendant to truthfully explain the case. The objects of interrogation are limited to offenders in administrative punishment cases and criminal suspects and defendants in criminal cases. The subject of interrogation is limited to law enforcement agencies, excluding lawyers. (iii) identification. Identification refers to asking the victim or witness to select the objects, places or people he has seen or heard from some similar objects, places or people. The subject of identification can be the victim and witness in the case, and the object of identification can be the criminal suspect in the case or the person who has a certain relationship with the case, or the articles or places related to the case. (d) investigation. Investigation refers to a special activity in which law enforcement officers come to the scene to discover and extract evidence. The subject of investigation is limited to law enforcement agencies, and lawyers have no right to investigate. From the perspective of collecting evidence, on the one hand, the inquest is to find and extract all kinds of physical evidence, on the other hand, the inquest record itself is also one of the types of evidence. (5) inspection. Inspection refers to the special activities of law enforcement agencies to inspect people related to cases according to law. The object of examination is the body of the living, also known as physical examination. Personal examination record is its main form of evidence. (6) search. Search refers to the behavior of law enforcement agencies to conduct compulsory search on places or personnel related to the case according to their functions and powers, and to find and extract evidence of special activities. The object of search can be places, people, vehicles, boats and other things. Search is an important way to find and extract all kinds of physical evidence and documentary evidence, and the search record itself is one of the types of evidence. (7) experiment. Experiment refers to the special activities of law enforcement agencies to simulate and reproduce the scene of a crime, the process of a crime or the process of a case, which is mainly applicable to criminal cases. In other kinds of cases, it may also be necessary to use this method of reappearing experiments to find out the cause of the accident or verify the statements of the parties and witnesses. (viii) Identification. Appraisal refers to the activities of using specialized agencies or personnel to appraise their professional technical knowledge and scientific and technological equipment, test relevant specialized issues and make appraisal conclusions. Legal purpose:
Article 5 of the Criminal Procedure Law, materials that can be used to prove the facts of a case are all evidence. Evidence includes (1) physical evidence; (2) Documentary evidence; (3) Testimony of witnesses; (4) the victim's statement; (5) confessions and excuses of criminal suspects and defendants; (6) Appraisal opinions; (seven) the inquest, inspection, identification, investigation and evidence collection and experimental records; (8) Audio-visual materials and electronic data. The evidence must be verified before it can be used as the basis for finalizing the case.