Idaho Admin. Code r. 31.01.01.261
The Idaho Rules of Evidence do not bind the presiding officer at hearing. No informality in a proceeding or in how testimony is taken invalidates any order made, approved, or confirmed by the Commission. The Commission generally follows rules on the admissibility of evidence that an Idaho district court would use in non-jury civil cases. But evidence (including hearsay) not admissible in non-jury civil cases may be admitted to determine facts not reasonably susceptible of proof under the Idaho Rules of Evidence. The presiding officer, with or without objection, may exclude evidence that is irrelevant, unduly repetitious, inadmissible on constitutional or statutory grounds, or inadmissible based on any evidentiary privilege recognized in Idaho courts, and order the presentation of such evidence to stop. All other evidence may be admitted if it is a type generally relied upon by prudent persons when conducting their affairs. The Commission may use its expertise, technical competence and special knowledge when evaluating evidence.
Idaho Admin. Code r. 31.01.01.261