Criminal investigation is a litigation activity in which public security organs and people's procuratorates collect evidence, confirm the crime, investigate the perpetrator and take necessary compulsory measures against the suspect in accordance with legal procedures. Investigation activities include interrogating criminal suspects, questioning witnesses, conducting inquests, inspecting, searching, seizing physical evidence, documentary evidence, audio-visual materials, seizing, freezing deposits, remitting money, identifying identities, finding fugitives, and taking necessary compulsory measures against criminal suspects. After a criminal case is put on file, investigators must carry out investigation in strict accordance with legal procedures, comprehensively and objectively collect and obtain evidence of the criminal suspect's guilt or innocence, and the crime is light or heavy, and review and verify the evidence. According to the need to take various means and measures of investigation, but must be carried out in strict accordance with legal conditions and procedures.
reference materials? Criminal investigation drama in personal library