Prison Act Article 85

A prison may not punish an inmate unless the punishment is pursuant to this Act or other laws. An inmate may not be punished twice for the same incident.
中文原文 監獄行刑法第85條
監獄非依本法或其他法律規定,對於受刑人不得加以懲罰,同一事件不得重複懲罰。

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