Mo. Rev. Stat. § 238.406
Any notes, bonds or other instruments in writing issued by a transit authority pursuant to the provisions of sections 238.400 to 238.412 are recognized to be securities in which all state and municipal officers and bodies, all banks, bankers, trust companies, savings banks, savings associations, building and loan associations, investment companies, and all other persons carrying on a banking business, all insurance companies, insurance associations, and other persons carrying on an insurance business, and all administrators, executors, guardians, trustees and other fiduciaries and all other persons whatsoever who are now or who may hereafter be authorized to invest in bonds or other obligations of the state of Missouri may properly and legally invest any funds, including capital, belonging to them, or within their control. Such obligations are recognized as securities which may properly and legally be deposited with and shall be received by any state or municipal officer or agency for any purpose for which the deposit of bonds or other obligations of this state is now or may hereafter be authorized.
§ 238.406, RSMo