1. Criminal detention is a compulsory method for public security organs and people's procuratorates to temporarily deprive the criminal or major suspect of personal freedom in case of legal emergency during investigation.
Criminal Procedure Law: Article 80 A public security organ may detain a flagrante delicto or a major suspect in any of the following circumstances:
(1) Being prepared to commit a crime, committing a crime or being discovered immediately after committing a crime;
(2) The victim or a witness on the spot identifies him as a criminal;
(3) criminal evidence is found around him or at his residence;
(four) attempted suicide, escape or escape after committing a crime;
(5) It is possible to destroy or forge evidence or collude with others;
(six) do not speak the real name and address, the identity is unknown;
(7) Being seriously suspected of committing crimes on the run, committing crimes for many times or committing crimes in association.
2. Arrest refers to the complete deprivation of personal freedom of criminal suspects and defendants who are approved or decided by procuratorates and courts and executed by public security organs, and there is evidence to prove that there are criminal facts and may be sentenced to fixed-term imprisonment or more.
Criminal Procedure Law: Article 79 A criminal suspect or defendant who has evidence to prove criminal facts and may be sentenced to fixed-term imprisonment or more shall be arrested if bail pending trial is insufficient to prevent the following social dangers:
(a) New crimes may be committed;
(two) there is a real danger of endangering national security, public safety or social order;
(three) may destroy or falsify evidence, interfere with the testimony of witnesses or collusion;
(4) It is possible to take revenge on the victim, prosecutor or accuser;
(5) attempting to commit suicide or escape.
If there is evidence to prove that there are criminal facts, it may be sentenced to fixed-term imprisonment of more than 10 years, or if there is evidence to prove that there are criminal facts, it may be sentenced to fixed-term imprisonment of more than 10 years, or if there is intentional crime or the identity is unknown, it shall be arrested.
If the circumstances are serious, a criminal suspect or defendant who has been released on bail pending trial or under residential surveillance may be arrested.