If a person has been criminally arrested, his family and friends can't see him in person, only lawyers can go to the detention center to see him. You should ask a lawyer to meet in time, interview, understand the case, provide legal help, and determine whether there is a lighter or mitigated circumstance, whether it is in line with the crime, etc. Strive for a lighter punishment and safeguard your legitimate rights and interests. If you want to handle the interview, you should provide the client's ID card and proof of the relationship between the client and the criminal suspect (household registration book, etc.).