Idaho Code § 67-8712: Presumption of validity.

After issuance, all bonds of the authority, and the purchase of all municipal bonds with the proceeds of the bonds, and any contracts entered into in connection with issuance of the bonds, shall be conclusively presumed to be fully authorized and issued under the laws of the state, and all persons, entities and municipalities are estopped from questioning the authorization, sale, issuance, execution or delivery of the bonds and other agreements by the authority.