Briefly describe the main ways of criminal investigation.

There are eight investigation methods in criminal procedure law: interrogating criminal suspects; Interviewing witnesses and victims; An inquest or inspection; Search; Seizure of physical evidence and documentary evidence; Identification; Identification; Wanted. Investigation refers to a series of special investigation means and compulsory measures taken by the investigation organ in order to find out the case, collect criminal evidence, confirm and arrest the criminal suspect and investigate the criminal responsibility of the criminal suspect.