Indiana Code Title 3. Elections § 3-14-5-6

Sec. 6.  In a criminal prosecution for violation of IC 3-14-1-7, IC 3-14-1-10, IC 3-14-1-13, IC 3-14-1-14, or IC 3-14-1-14.5, a witness, except the person who is accused and on trial, may not be excused from answering a question or producing a book, paper, or other thing on the ground that the witness' answer or the thing to be produced may tend to incriminate the witness or render the witness liable to a penalty.  However, the witness' answer or the thing produced by the witness may not be used in a proceeding against the witness, except in a prosecution for perjury in so testifying.