Administrative Procedure Act Article 37

During the administrative procedure, the party may, in addition to producing evidence on his own initiative, file an application to the administrative authority for inquisition into facts and evidence; provided that, if the administrative authority believes that no inquisition is necessary, it may choose not to conduct inquisition but shall give its explanation in the part of the notice dealing with reasons as required by article 43 hereof.
中文原文 行政程序法第37條
當事人於行政程序中,除得自行提出證據外,亦得向行政機關申請調查事實及證據。
但行政機關認為無調查之必要者,得不為調查,並於第四十三條之理由中敘明之。

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