First of all, public security organs should accept criminal cases. After receiving a report of a criminal case, the public security organ shall file a case within 24 hours, and then organize the police to conduct investigation.
Secondly, the stage of case investigation is the stage of public security organs collecting evidence. In the process of case investigation, the public security organ will interrogate the suspect, inspect the scene and collect evidence. After the evidence is collected completely, a public prosecution will be brought to the people's court, which will try the criminals' criminal acts.
Finally, according to Article 3 of the Procedures for Handling Criminal Cases by Public Security Organs, the basic functions and powers of public security organs in criminal proceedings are to file, investigate and pre-examine criminal cases according to law; Decide and implement compulsory measures; Failing to pursue criminal responsibility according to law and not filing a case, or having filed a case and revoked it; The case that should be prosecuted after the investigation is completed shall be transferred to the people's procuratorate for examination and decision; If a criminal suspect who is not serious enough for criminal punishment needs administrative treatment, he shall be dealt with according to law or transferred to relevant departments for handling; For criminals sentenced to fixed-term imprisonment, if the remaining sentence is less than three months before delivery for execution, they will execute the punishment on their behalf; Execution of criminal detention, deprivation of political rights and deportation.
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A criminal case refers to a case in which a criminal suspect or defendant is accused of violating social relations protected by criminal law and is investigated, tried and given criminal sanctions (such as fines, fixed-term imprisonment, death penalty, deprivation of political rights, etc.) by the state. ) in order to investigate the criminal responsibility of criminal suspects or defendants.