Civil Aviation Act Article 44

No person shall dropped of object, sprayed, dragged of aircraft and other object or parachuted from an aircraft in flight, however, that such prohibition shall not apply where the act is in furtherance of flight safety or rescue mission, or is approved by CAA.
中文原文 民用航空法第44條
航空器飛航中,不得投擲任何物件、噴灑、拖曳航空器及其他物體或跳傘。
但為飛航安全、救助任務或經民航局核准者,不在此限。

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