The Regulation Governing the Handling of Investigation Procedures for Civil and Public Aircraft Occurrence Article 15

If any of the following situations is likely to occur, the Investigator-in-Charge may, in accordance with Article 13 of the Act, permit clearance at the scene of a major aviation occurrence:1. Further damage to the wreckage.2. Occurrence of secondary disasters.3. Injury to the general public.4. Environmental pollution.5. Suspension of airport operations.
中文原文 民用航空器及公務航空器重大飛航事故調查作業處理規則第15條
有下列情形之一發生之虞者,主任調查官得依本法第十三條規定同意對重大飛航事故之現場進行必要之清理:
一、殘骸受到二度破壞。
二、發生二次災害。
三、一般民眾受到傷害。
四、環境污染。
五、機場無法運作。

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