The Regulation Governing the Handling of Investigation Procedures for Railway Occurrence Article 7

Members of the on-scene team and the investigation task force shall carry a TTSB-issued investigator identification card when entering restricted areas such as the scene of the occurrence, wreckage storage area, reconstruction area, and investigation command post.
中文原文 重大鐵道事故調查作業處理規則第7條
先遣小組及專案調查小組人員應持運安會核發之調查識別證進入事故現場、存放區、重建區、調查指揮中心等與事故相關之管制區。

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