Idaho Admin. Code r. 62.01.01.206
Persons other than the persons named in Rules 200 through 203 are not parties for the purpose of any statute or rule addressing rights or obligations of parties to a contested case. In proceedings in which persons other than a petitioner, respondent, or intervenor would be expected to have an interest, persons may request the agency in writing that they be notified when proceedings of that kind are initiated. These persons are called "interested persons." Interested persons may become intervenors or public witnesses. The agency must serve notice of such proceedings on all interested persons. If not previously identified by the agency, the presiding officer may identify and serve potentially interested persons within their discretion or otherwise direct the agency to identify and serve such persons.
Idaho Admin. Code r. 62.01.01.206