Indiana Code Title 5. State and Local Administration § 5-1-4-19

Sec. 19. (a) All money received by an authority or held by a trustee under section 15 of this chapter, whether as proceeds from the sale of bonds, from revenues, or otherwise, shall be deemed to be trust funds to be held and applied solely as provided in this chapter, but prior to the time when needed for use may be invested to the extent and in the manner determined by the authority.  Such funds shall be deposited, held, and secured in accordance with the general laws of the state relating to the handling of public funds.

(b) The resolution authorizing the issuance of bonds or the trust agreement securing such bonds shall provide that any officer to whom, or any bank or trust company to which, such money shall be entrusted shall act as trustee of such money and shall hold and apply the same for the purposes of this chapter, subject to the provisions of this chapter and of the authorizing resolution or trust agreement.

(c) The handling and expenditure of funds coming into the possession of an authority shall be subject to audit and supervision by the state board of accounts.  The cost of such audit may be treated as an expense of operation.