At least two policemen should enforce the law.
If inspection is to be carried out, an inspection certificate is needed. After the inspection, the witness and the inspected need to sign for confirmation.
Legal Link: Procedures for Public Security Organs to Handle Administrative Cases Article 40 When investigating and collecting evidence, there shall be no less than two people's policemen, and they shall show their law enforcement status.
Article 53 If it is necessary to summon an illegal suspect for investigation, with the approval of the police station, the case handling department of the public security organ at or above the county level or the person in charge of the entry-exit frontier inspection organ, a summons card shall be used for summoning. After showing their work certificates, the people's police can verbally summon the illegal suspects found on the spot, and indicate the process, time and departure time of the illegal suspects in the interrogation record.
If a unit violates the regulations on public security management and needs to summon its directly responsible person in charge and other directly responsible personnel, the provisions of the preceding paragraph shall apply.
Suspects who violate public security management, fire safety management, exit and entry management without justifiable reasons and other illegal suspects who can be summoned according to law may be summoned by force with the approval of the director of the police station, the case-handling department of the public security organ at or above the county level or the entry-exit frontier inspection organ. When forced to summon, you can use binding police equipment such as handcuffs and police ropes according to law.