Idaho Code · § 31-807A — Commissioners must be disinterested

No member of the board must be interested, directly or indirectly, in property purchased for the use of the county, nor in any purchase or sale of property belonging to the county, nor in any contract made by the board or other person on behalf of the county, for the erection of public buildings, the opening or improvement of roads, or the building of bridges, or for other purposes unless otherwise authorized by law.