The retention certificate is an archived document in triplicate. The first copy is a stub, which is filed for future reference; The second copy is a voucher for the execution of detention, which should be announced to the detained person, and the detained person should be ordered to indicate the specific time of the announcement, and sign or press the fingerprint at the same time. If he refuses to sign or press his handprint, he should indicate it and bring this copy back to the volume; The third joint is the deputy joint, which is the voucher sent to the detention center and collected by the detention center.