Legal basis: Article 143 of the Procedural Provisions for Handling Criminal Cases by Public Security Organs. When executing an arrest, the arrested person must show his arrest warrant and be ordered to sign the arrest warrant and press his fingerprint. If the investigator refuses to sign or fingerprint, the investigator shall indicate it. After the arrest, the arrested person shall be immediately sent to the detention center for custody. No fewer than two investigators shall carry out the arrest. Article 144 An arrested person must be interrogated within 24 hours after arrest. If it is found that the arrest should not be made, with the approval of the person in charge of the public security organ at or above the county level, a notice of release shall be made and sent to the detention center and the people's procuratorate that originally approved the arrest. The detention center immediately releases the arrested person with a release notice and issues a release certificate.