The criminal lawyer explained what to do, because the case needed to be summoned from different places.

The technical term for assisting in the investigation is summons. According to Article 82 of the Law on Public Security Administration Punishment, if it is necessary to summon a person who violates public security administration for investigation, he shall be summoned with a summons certificate with the approval of the person in charge of the case-handling department of the public security organ. The people's police may summon an offender found on the spot who violates the administration of public security orally after producing his work certificate, but it shall be indicated in the inquiry record.

The public security organ shall inform the summoned person of the reasons and basis for summoning. A person who refuses to accept a summons or evades it without justifiable reasons may be summoned by force.

According to the provisions of Article 83, after being summoned, the public security organ shall promptly inquire and verify, and the time for inquiry and verification shall not exceed eight hours. If the situation is complicated and the punishment of administrative detention can be applied according to the provisions of this law, the time for questioning and verification shall not exceed 24 hours. The public security organ shall promptly notify the family members of the summoned person of the reason and place of the summons.

2. In addition to the Public Security Administration Punishment Law and the Criminal Procedure Law, Article 9 of the Police Law stipulates that: in order to maintain social order, the people's police of public security organs may cross-examine and inspect persons suspected of violating the law and crime on the spot upon showing corresponding certificates; After cross-examination and inspection, in any of the following circumstances, with the approval of the public security organ, it may be taken to the public security organ for further cross-examination:

(1) Accused of a criminal act;

(2) Suspected of committing a crime on the spot;

(3) Suspected of committing a crime, whose identity is unknown;

(4) The articles carried may be stolen goods.

The detention time of the interrogated person shall not exceed 24 hours from the time he arrives at the public security organ. Under special circumstances, it may be extended to 48 hours with the approval of the public security organ at or above the county level.

In the process of handling a case, the police may summon relevant personnel from different places to understand the specific situation, and citizens must cooperate.