Idaho Code § 36-109
The director may receive on behalf of the department any money or real or personal property donated, bequeathed, devised, or conditionally granted to the department. Such moneys received directly or derived from the sale of such property shall be deposited in an account in the agency asset fund to be known as the fish and game nonexpendable trust account, which is hereby established. The principal amount of moneys in the account are not subject to appropriation. Interest earned on investment of moneys in the account are subject to appropriation to carry out the terms or conditions of such donation, bequest, devise, or grant, and shall be used for no other purpose.
Moneys in the account shall be invested by the state treasurer in the manner provided for investment of idle state moneys in the state treasury by section 67-1210, Idaho Code. Interest received on all such investments shall be paid into the fish and game nonexpendable trust account.
Idaho Code § 36-109