Administrative Penalty Act Article 33

When performing his duty, an officer of the administrative agency shall show the actor an evidentiary document in relation to the performance of his duty or display a symbol for adequate identification, and shall inform the actor of the law or regulation which the actor has violated.
中文原文 行政罰法第33條
行政機關執行職務之人員,應向行為人出示有關執行職務之證明文件或顯示足資辨別之標誌,並告知其所違反之法規。

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