Regulations Governing the Detention of the People of the Mainland China Area and the Residents of Hong Kong and Macao Article 12

Detainees may send or receive correspondence, providing its contents passed through the required examination by detention centers. Except for such mail or correspondence is determined to be prejudicial to the administration order or jeopardize the safety and security of the detention center, every detainee shall be permitted to send or receive such mail or correspondence.