Act Governing Food Safety and Sanitation Article 38

The method of test for foods, food additives, food utensils, food containers or packaging and food cleansers to be used by the competent authority at all levels shall be consulted with and advised by the Advisory Committee of Food Testing Methods and then be prescribed by the central competent authority; In the absence of any prescribed method, an internationally recognized method may be used.
中文原文 食品安全衛生管理法第38條
各級主管機關執行食品、食品添加物、食品器具、食品容器或包裝及食品用洗潔劑之檢驗,其檢驗方法,經食品檢驗方法諮議會諮議,由中央主管機關定之;未定檢驗方法者,得依國際間認可之方法為之。

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