The police have taken my brother away to assist in the investigation for three days, but they still don't let him go and don't inform their families, who are very anxious and worried! ! ! !

Hello, the practice of the public security organs is unreasonable. China's criminal procedure law stipulates that when a public security organ detains a person, it must produce a detention certificate. After detention, the family members of the detainee or their units shall be informed of the reasons and places of detention within 24 hours, except in cases where the investigation is hindered or notification cannot be made. The public security organ shall interrogate the detained person within 24 hours after detention. If it is found that it should not be detained, it must be released immediately and a release certificate will be issued. The public security organ shall interrogate the detained person within 24 hours after detention. If it is found that it should not be detained, it must be released immediately and a release certificate will be issued. If the public security organ deems it necessary to arrest the detained person, it shall submit it to the people's procuratorate for examination and approval within three days after detention. Under special circumstances, the approval time can be extended by one to four days.