The Implementation Regulation for Leave of Prisoners Article 7

If a prisoner fails to comply with Article 3 or Article 4, the Prison may change the leave following review and filing with the supervisory authority. If a prisoner breaches Paragraph 1 of the preceding article and the prisoner’s leave is cancelled following review and filing with the supervisory authority, the leave period shall be excluded from the period of prison sentence.In the event of the preceding paragraph, a notice shall be given to the contact person at the location for the purpose of the leave.In emergency situations, a Prison may suspend the prisoner’s leave in advance and then make a filing with the supervisory authority for further handling.
中文原文 受刑人外出實施辦法第7條
受刑人有不符第三條、第四條之情形,監獄得經審核後報監督機關變更其外出;受刑人違反前條第一項之規定者,經審核後報監督機關取消其外出,其在外期間不計入刑期。
前項情形,應通知外出目的處所之聯絡人。
有急迫狀況者,監獄得暫時先行停止該受刑人外出,再行報監督機關處理。

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