Enforcement Rules of the Detention Act Article 10

When detention center personnel learns in the performance of duties or is notified by court or prosecutors office that an admitted inmate is a co-defendant or involved in a same case as other defendants, the detention center should assign co-defendants or defendants in the same case to different housing areas pursuant to Paragraph 3, Article 15 of the Act.
中文原文 羈押法施行細則第10條
看守所人員執行職務知悉或經法院、檢察署通知入所之收容人係共同被告或案件相關者,應依本法第十五條第三項規定分配於不同舍房。

English translation for reference only; the Chinese text prevails. Not legal advice.