Regulations Governing Coordination & Liaison between Coast Guard Administration, Executive Yuan and Police, Immigration, & Fire Organizations Article 6

If required, the Coast Guard may request the police department to support in arrest of criminals, conducting roadside inspection, transporting supplies to offshore islands and islets, providing emergency medical care and other patrol routines.If required, the police department may request the Coast Guard to support in operations of crime investigation, arrest and other police duties.If required, the Coast Guard and the National Immigration Agency may collaborate on missions of illegal immigrant investigations.Upon receiving the support request for manpower or mechanical equipment as described in the preceding three paragraphs, the Coast Guard, the police department and the National Immigration Agency shall provide the supports as requested, unless provided with justified cause to prevent from such support; and in case of any insufficiency, the Coast Guard or the police department may request the aids from its superior agency.
中文原文 海岸巡防機關與警察移民及消防機關協調聯繫辦法第6條
海巡機關於必要時得請求警察機關支援執行緝捕人犯、聯合路檢、外離島物資運補、緊急醫療及其他巡防事務。
警察機關於必要時得請求海巡機關支援執行犯罪調查、緝捕人犯及其他警察勤務。
海巡機關與移民機關於必要時,得相互支援執行查緝非法入出國(境)之相關勤務。
海巡機關與警察、移民機關於接獲前三項之人力或機具申請支援時,除有正當理由外,應配合調派支援,若不足時,得報請上級機關調派之。

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