1. Asking. 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 common measure and method of obtaining evidence in any case.
2. Interrogation. Interrogation refers to the method by which law enforcement agencies require the violator, criminal suspect or criminal defendant to truthfully explain the case. The objects of interrogation are limited to cases of administrative punishment of offenders and criminal cases of suspects and defendants. The subject of interrogation is limited to law enforcement agencies, excluding lawyers.
3. Identify. Identification refers to asking the victim or witness to pick out what he has seen and heard from a number of 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.
4. Investigation. Investigation refers to the special activities of law enforcement officers to investigate the scene, find and extract evidence. The subject of investigation is limited to law enforcement agencies, and lawyers have no right to investigate. From the point of view of collecting evidence, on the one hand, inquest is an important way to find and extract all kinds of physical evidence, on the other hand, inquest record itself is also one of the types of evidence.
5. check. Inspection refers to the special activities of law enforcement agencies to inspect the parties to a case according to law. The object of inspection is living body, also known as personal inspection. Personal examination record is its main form of evidence.
6. Search. Search refers to the special activities of law enforcement agencies to conduct compulsory search on places or personnel related to cases according to their functions and powers, and to find and extract evidence. 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 crime scene, criminal process or 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 crime or verify the statements of the parties and witnesses.
8. Identification. Identification refers to the activities of using specialized agencies or personnel to identify their professional technical knowledge and scientific and technological equipment, to test relevant specialized issues, and to make identification conclusions.
To sum up, according to the relevant provisions of the law, if a criminal suspect destroys the crime scene or eliminates the tools for committing crimes, he can be considered as destroying evidence and can be detained in advance.
Legal basis:
Article 82 of the Criminal Procedure Law of People's Republic of China (PRC)
The public security organ may detain a flagrante delicto or a major suspect in any of the following circumstances:
1. Those who are ready to commit a crime, are committing a crime or are found immediately after committing a crime;
2. The victim or the witness at the scene identified the crime;
3. Evidence of the crime is found near the crime scene or at the residence;
4. Attempted suicide, fled or escaped after committing the crime;
5. It is possible to destroy, forge evidence or collude with others;
6. Do not tell your real name and address, and your identity is unknown;
7. It is possible to commit crimes on the run, commit crimes many times, and collude with each other;
8. There were victims or witnesses at the time of committing the crime.
7. There are major suspects who commit crimes on the run, commit crimes many times, and commit crimes in partnership.