Idaho constitution
Article XII
Section 4

No county, town, city, or other municipal corporation, by vote of its citizens or
otherwise, shall ever become a stockholder in any joint stock company, corporation
or association whatever, or raise money for, or make donation or loan its credit to,
or in aid of, any such company or association: provided, that cities and towns may
contract indebtedness for school, water, sanitary and illuminating purposes:
provided, that any city or town contracting such indebtedness shall own its just
proportion of the property thus created and receive from any income arising
therefrom, its proportion to the whole amount so invested.