For the purpose of ascertaining the correctness of any return, making a return where none has been made, determining the liability of any person for any tax payable under this act or the liability at law or in equity of any person in respect to any tax provided in this act or collecting any such liability, the state tax commission or its duly authorized deputy is authorized-
A summons issued under the provisions of this section may be served by the state tax commission or its deputy or by any other person authorized to serve process under the laws of this state by a copy delivered in and to a person to whom it is directed; and the certificate of service signed by the person serving the summons shall be evidence of the facts it states on the hearing of an application for the enforcement of the summons. When the summons requires the production of books, papers, records, or other data, it shall be sufficient if such books, papers, records, or other data are described with reasonable certainty.
The time and place of examination pursuant to the provisions of this section shall be such time and place as may be fixed by the state tax commission or its deputy and as are reasonable under the circumstances, provided that in the case of a summons the date fixed for appearance before the state tax commission or its deputy shall not be less than twenty (20) days from the time of service of the summons.
No taxpayer shall be subjected to unreasonable or unnecessary examinations or investigations.
Idaho Code § 63-3042