The Regulation Governing the Handling of Investigation Procedures for Marine Occurrence Article 5

Upon receipt of a notification, where the TTSB deems it necessary, it may designate an on-scene investigator to lead the on-scene team to the scene of the occurrence to perform actions necessary for determining the occurrence, including securing evidence and witnesses. The shipowner, the ship operator, the local government of the area of the occurrence, the authority responsible for the scene of the occurrence, the port management authorities (agencies), the MPB, or the CGA shall provide necessary assistance to the on-scene investigator in performing his or her duties.
中文原文 重大水路事故調查作業處理規則第5條
運安會接獲通報後,認有必要時,得先行任命現場調查官,率領先遣小組至事故現場,執行事故認定必要之作為,包含留置證物及證人。
船舶所有人、營運人、事故地區之地方政府、事故現場管理機關、港口經營管理機關(構)、航港局或海巡署,應協助現場調查官執行任務。

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