Ala. Code § 11-101A-17
Securities issued under this chapter are hereby made legal investments for savings banks and insurance companies organized under the laws of the state. Unless otherwise directed by the court having jurisdiction thereof or the document that is the source of authority, a trustee, executor, administrator, guardian, or one acting in any other fiduciary capacity may, in addition to any other investment powers conferred by law and with the exercise of reasonable business prudence, invest trust funds in securities of an authority. The governing body of any authorizing subdivision, or any county or municipality in which any project of an authority may be situated, may, in its discretion, invest in securities of the authority any idle or surplus money held in its treasury which is not otherwise earmarked or pledged.
Ala. Code § 11-101A-17 (1975)