Indiana Code Title 36. Local Government § 36-2-6-13

Sec. 13. (a) Money paid out of the county treasury in violation of this article may be recovered by the county executive in an action in the name of the state against the officer who paid the money or assisted in the payment, the person who received the money, or both.  If the county executive fails to bring the action within thirty (30) days after the illegal payment, a citizen or taxpayer may make a written demand on the county executive to bring the action and may then bring the action in the name of the state for the benefit of the county if the executive fails to comply with the citizen's or taxpayer's demand.

(b) If an action brought under this section is successful, the court shall award the amount of money paid out of the treasury illegally, plus interest at the rate of six percent (6%) per year, to the county and shall award reasonable attorney's fees and expenses to the plaintiff.