Prison Act Article 92

An inmate may file a written or verbal petition to the prison, inspection team, or other inspectors.The prison shall set up an opinion box at an appropriate place for inmates to file petitions or voice opinions.The prison shall process the petitions or opinions of inmates in an appropriate manner.
中文原文 監獄行刑法第92條
受刑人得以書面或言詞向監獄、視察小組或其他視察人員提出陳情。
監獄應於適當處所設意見箱,供受刑人提出陳情或提供意見使用。
監獄對於受刑人之陳情或提供意見,應為適當之處理。

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