Customs Personnel Management Act Article 13

The job transfer, job rotation or job mobility of customs officers can be implemented in the induction phrase; the relevant regulations shall be promulgated by the MOF.
中文原文 關務人員人事條例第13條
關務人員職務得實施職期調任、互調或輪調;其辦法,由財政部定之。

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