The Enforcement Rules of Dietitian Act Article 13

Where a representative of the competent authority is appointed to inspect and gather information of the institution in accordance with Article 25 of the Act, said representative shall present his/her identification credentials before commencing the work.
中文原文 營養師法施行細則第13條
主管機關人員執行本法第二十五條規定之檢查及資料蒐集時,應出示身分證明文件。

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