Administrative Procedure Act Article 53

A witness or expert witness is entitled to claim payment by the administrative authority of per diem allowance and traveling expenses as specified by law, and an expert witness is entitled to claim, in addition thereto, a reasonable amount of remuneration.A witness or expert witness may request that the administrative authority make advance payment of the expenses and remuneration payable under the preceding paragraph, in such amount as the administrative authority may determine at its discretion.Unless otherwise provided by law, the schedule of standard cost and expenses payable under paragraph 1 hereof shall be established by the Executive Yuan.
中文原文 行政程序法第53條
證人或鑑定人得向行政機關請求法定之日費及旅費,鑑定人並得請求相當之報酬。
前項費用及報酬,得請求行政機關預行酌給之。
第一項費用,除法規另有規定外,其標準由行政院定之。

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