After a criminal suspect is criminally detained, the family members should take the initiative to contact the public security agency handling the case. They may advocate not mailing the "Detention Notice" and have the criminal suspect's relatives go directly to the public security agency to sign for it. Generally, as long as the crime can be proven, Relatives or friends of the suspect and the public security organs will agree to this legitimate request. In this way, you can meet with the organizers and learn as much as possible about the situation, and at the same time, try not to spread the information about the family members' detention.
If the public security organ still does not agree with the family member’s signature on the detention notice, the family member should immediately entrust a lawyer to go to the detention center to meet with the suspect in order to understand the case in a timely manner and study countermeasures.