Ind. Code § 34-13-9-9

Sec. 9. A person whose exercise of religion has been substantially burdened, or is likely to be substantially burdened, by a violation of this chapter may assert the violation or impending violation as a claim or defense in a judicial or administrative proceeding, regardless of whether the state or any other governmental entity is a party to the proceeding. If the relevant governmental entity is not a party to the proceeding, the governmental entity has an unconditional right to intervene in order to respond to the person's invocation of this chapter.