No trustee or employee of a road district may be directly or indirectly interested in any contract, work, or business of the district, or the sale of any article, the expense, price, or cost of which is paid by the district, nor in the purchase of any real, personal, or other property belonging to the district, or which shall be sold for taxes or assessments, or by virtue of legal process at the suit of the district. No trustee may be a joint or co-owner of land in the road district with an employee of the same road district. This section does not apply to any trustee or employee of a district consisting of less than twenty-five residents for a winter road maintenance contract or work.
SDCL 31-12A-24