Legal basis: Provisions of the Ministry of Justice on Lawyers Meeting Criminals in Prison Article 5 When lawyers need to meet criminals in prison, they can submit copies of the following materials to the prison where the criminals are located by fax, mail or direct submission, and present the originals to the prison on the day of the meeting: (1) Lawyer's practice certificate; (2) the certificate of the law firm; (3) the power of attorney of the criminal himself or his guardian or close relatives, the official letter of legal aid or the relevant supporting documents for investigation and evidence collection in another case. The prison shall keep the original certificate issued by the law firm that the lawyer met with the prisoner in custody.