Indiana Code Title 4. State Offices and Administration § 4-21.5-3-13

Sec. 13. (a) An individual who has served as investigator, prosecutor, or advocate in a proceeding or in its preadjudicative stage may not serve as an administrative law judge or assist or advise the administrative law judge in the same proceeding.

(b) An individual who is subject to the authority, direction, or discretion of an individual who has served as investigator, prosecutor, or advocate in a proceeding or in its preadjudicative stage may not serve as an administrative law judge or assist or advise the administrative law judge in the same proceeding.

(c) An individual who has made a determination of probable cause or other equivalent preliminary determination in a proceeding may serve as an administrative law judge or assist or advise the administrative law judge in the same proceeding, unless a party demonstrates grounds for disqualification under section 10 of this chapter.  This subsection does not apply after June 30, 2020, to an agency whose proceedings are subject to the jurisdiction of the office of administrative law proceedings.

(d) An individual may serve as an administrative law judge or a person presiding under sections 28, 29, 30, and 31 of this chapter at successive stages of the same proceeding, unless a party demonstrates grounds for disqualification under section 10 of this chapter.  This subsection does not apply after June 30, 2020, to an agency whose proceedings are subject to the jurisdiction of the office of administrative law proceedings.

(e) A violation of this section is subject to the sanctions under sections 36 and 37 of this chapter.