Law of Extradition Article 7

Without the consent of the Government of the Republic of China, the country to which an accused is delivered up may not prosecute or punish an offense other than that specified in the written requisition for extradition; provided, that this shall not apply if the person voluntarily chosed to remain for ninety (90) days or more in that country after the conclusion of legal proceedings or the completion of the execution of punishment.After a person has been extradited, if he commits another offense within the jurisdiction of the country to which he was delivered up, that country may prosecute or punish him accordingly.
中文原文 引渡法第7條
請求國非經中華民國政府同意,不得追訴或處罰引渡請求書所載以外之犯罪。
但引渡之人犯,在請求國之訴訟程序終結或刑罰執行完畢後,尚自願留居已達九十日以上者,不在此限。
引渡人犯於引渡後,在請求國另犯他罪者,該請求國仍得追訴或處罰之。

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