Enforcement Rules of the Control Act Article 3

A member of the Control Yuan shall recuse himself or herself from a case involving the approval or handling of people's written complaints, investigation cases or examination censure or impeachment cases in any of the following circumstances:1. The party to the complaint or case is the member or his or her spouse, former spouse, betrothed, blood relative within the fifth degree of kinship, relative by marriage within the third degree of relationship, or previously a kin of such relationship.2. The member is or has been a legal representative of the party to the complaint or case.3. The member has adjudicated in civil, criminal or administrative proceedings related to the complaint or case or has served as the agent ad litem or defense attorney of the interested party.4. There exist any other circumstances that could prevent the member from performing impartially his or her duties of approval, handling, investigation or examination responsibly. A written explanation for recusal in cases referred to in the preceding paragraph shall be submitted to the president of the Control Yuan for determination. In the event that a request for recusal is not made in any of the aforementioned circumstances, the president of the Control Yuan may render a decision on the recusal.
中文原文 監察法施行細則第3條
監察委員批辦人民書狀、調查案件或審查糾舉、彈劾案件,有左列情形之一者,應自行迴避。
一、書狀或案件之當事人為其本人或其配偶、前配偶、訂有婚約者或與其有五親等內血親、三親等內姻親或曾有此親屬關係者。
二、現或曾為書狀或案件當事人之法定代理人者。
三、曾參與書狀或案件有關之民、刑事及行政訴訟裁判或曾為當事人之訴訟代理人或辯護人者。
四、依其他情形足認由其執行批辦、調查或審查職務顯有偏頗之虞者。
前項迴避,應以書面敘明理由陳報院長決定之;其有前項情形未自請迴避者,得由院長為迴避之決定。

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