Idaho Code § 61-521: Authority to enter premises.

The commissioners and their officers and employees shall have power to enter upon any premises occupied by any public utility, for the purpose of making the examinations and tests and exercising any of the other powers provided for in this act, and to set up and use on such premises any apparatus and appliances necessary therefor. The agents and employees of such public utility shall have the right to be present at the making of such examination and tests.