Indiana Code Title 8. Utilities and Transportation § 8-14.5-6-4

Sec. 4. (a) Before issuing a series of bonds or notes, the authority shall publish a notice of its determination to issue the bonds or notes. The notice shall be published one (1) time in two (2) newspapers published and of general circulation in the city of Indianapolis.

(b) No action to contest the validity of:

may be brought after the fifteenth day following publication of the notice required by subsection (a).

(c) If a lease or contract is entered into under this chapter after bonds or notes relating to the lease or contract are issued, the authority may publish notice of execution of the lease or contract as set forth in subsection (a). No action to contest the validity of such a lease or contract may be brought after the fifteenth day following publication of the notice.

(d) If an action challenging a lease, contract, bonds, or notes is not brought within the time prescribed by this section, the lease, contract, bonds, or notes shall be conclusively presumed to be fully authorized and valid under the laws of the state and any person or entity is estopped from further questioning the authorization, validity, execution, delivery, or issuance of the contract, lease, bonds or notes.