Okla. Stat. tit. 2, § 4013

Bonds as securities - Investment - Collateral security. Bonds issued pursuant to provisions of the Oklahoma State University Veterinary Medicine Authority Act are hereby made securities in which all public officers and public boards, agencies and instrumentalities of the state and its political subdivisions, all banks, trust companies, trust and loan associations, investment companies, and others carrying on a banking business, and all insurance companies and insurance associations, and others carrying on an insurance business, may legally and properly invest. Such bonds are also approved as collateral security for the deposit of any public funds and for the investment of trust funds.