Idaho Const. art. XIV, § 1

All able-bodied male persons, residents of this state, between the ages of eighteen and forty-five years, shall be enrolled in the militia, and perform such military duty as may be required by law; but no person having conscientious scruples against bearing arms, shall be compelled to perform such duty in time of peace. Every person claiming such exemption from service, shall, in lieu thereof, pay into the school fund of the county of which he may be a resident, an equivalent in money, the amount and manner of payment to be fixed by law.