Idaho Code § 36-108
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 expendable trust account, which is hereby established. Moneys in the account may be appropriated to carry out the terms or conditions of such donation, bequest, devise, or grant, or in the absence of such terms or conditions, may be appropriated to the commission to expend, use, and administer such funds as advisable in the public interest and in accordance with the policies set forth in the Idaho fish and game code, and shall be used for no other purpose.
Pending such expenditure or use, surplus moneys in the fish and game expendable trust 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 expendable trust account.
Idaho Code § 36-108