Ind. Code § 16-22-7-13

Sec. 13. If a member of the governing board has any pecuniary interest in a contract, an employment, a purchase, or a sale made under this chapter, the director shall disclose that interest and shall not vote on the matter. If the member fails to disclose the interest, the transaction is voidable if a suit is filed in circuit court, superior court, or probate court in not less than thirty (30) days.