What are the methods of investigation? What investigation measures are there?

The ways of criminal investigation include interrogating criminal suspects; Interviewing witnesses and victims; An inquest or inspection; Search; Seizure of physical evidence and documentary evidence; Identification; Identification; Wanted, etc.

Taking the inquest and inspection as an example, different investigation channels will have corresponding measures:

According to the provisions of the Criminal Procedure Law, the inquest can be divided into five types: on-site inquest, physical evidence inspection, corpse inspection, personal inspection and investigation experiment.

1. Site inspection. On-the-spot investigation is a kind of investigation activity in which investigators investigate and inspect the crime scene of criminal cases. The crime scene refers to the place where criminals commit crimes and other places that leave traces and physical evidence related to crimes.

(1) Protect the site. Article 102 of the Criminal Procedure Law stipulates that all units and individuals have the obligation to protect the crime scene and immediately notify the public security organs to send personnel to conduct an inquest. After receiving the case, the investigators should quickly rush to the crime scene to protect the scene.

(2) When investigating the scene, the investigators must hold the certification documents of the public security organ or the people's procuratorate.

(3) When necessary, personnel with specialized knowledge may be assigned or hired to conduct on-site inspection under the auspices of investigators. In order to ensure the objectivity of the inquest, two witnesses unrelated to the case should also be invited to the scene.

(4) In the process of on-site inspection, investigators should also investigate and interview the victims, witnesses, informants, etc. in time, understand the situation before and at the time of the crime, discover and collect all kinds of information related to the case, and take emergency measures to collect evidence in time.

(5) A record shall be made of the on-site inspection, which shall be signed or sealed by the investigators, other persons participating in the inspection and witnesses. Major cases, especially major cases, should be recorded on the spot.