Ind. Code § 34-45-1-1

Sec. 1. An attachment shall not issue against a witness who has been served a copy only of the summons until the party applying for the attachment or the party's attorney makes an affidavit in the court from which the party is seeking the attachment, stating that the party or the party's attorney has reasonable cause to believe, and does believe, that the witness against whom the summons issued has knowledge of the service of the summons by copy in time to have obeyed its command.