Is there a charge for visiting the prison? How long can a prisoner write a letter after he goes to prison?

No fees are charged, but the interviewee is a person or guardian who has marriage, consanguinity and adoption relationship with the criminal (including husband, wife, father, mother, father-in-law, mother, son, daughter and their spouses, grandfather, mother, grandfather, grandson, daughter and their spouses, adoptive father, mother, adopted son, daughter and their spouses, stepfather, mother, stepson, daughter and their spouses). Non-relatives (or guardians) meeting criminals must be examined by the prison administration and approved by the warden; Non-relatives (or guardians) meeting with important criminals must be examined by the prison management department and the warden, approved by the warden, and reported to the prison management department of the provincial bureau for the record. A prisoner may correspond with others during his sentence, and may write letters after being transferred from the detention center to the prison, but the letters shall be inspected by the prison. Letters found in prison that hinder the reform of criminals may be detained.