Idaho Admin. Code r. 62.01.01.207
Persons not parties and not called by a party who may be permitted to testify at hearing are called "public witnesses." Public witnesses do not have parties' rights to examine witnesses or otherwise participate in the proceedings as parties. Public witnesses' written or oral statements and exhibits are subject to examination and objection by parties. Subject to a presiding officer's determination of hearing procedure and admissibility of evidence, public witnesses have a right to offer evidence at hearing through written or oral statements and exhibits, except that public witnesses offering expert opinions at hearing or detailed analyses or detailed exhibits must comply with these rules and any order of the presiding officer regarding the prehearing disclosure of expert testimony.
Idaho Admin. Code r. 62.01.01.207