International Airport Park Development Act Article 17

The Airport Corporation shall provide free-of-charge venues required for customs, immigration, quarantine and security inspection operations, as well as facilities for inspection of goods and luggage.
中文原文 國際機場園區發展條例第17條
機場公司應無償提供海關、移民、檢疫及安檢等行使公權力機關作業所需之通關場地及貨物、行李檢查所需之設施。

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