Idaho Code § 72-1382
The director shall, when a question arises concerning the representation of employees in a collective bargaining unit, investigate such controversy and certify to the parties the name or names of the representatives who have been selected. In any such investigation the director shall provide for an appropriate hearing, and may take a secret ballot of employees to ascertain such representatives. In all cases where a secret ballot is taken, the ballot shall permit a vote against representation by anyone named on the ballot; provided, however, that nothing in this section shall be construed as authorizing the director to conduct an election on any matter which is within the exclusive jurisdiction of any federal official or board; and provided further that no election shall be directed in any bargaining unit or subdivision within which, in the preceding twelve (12) month period, a valid election was held.
Idaho Code § 72-1382