Indiana AO 88A -Subpoena to Testify at a Deposition in a Civil Action is a legal document issued by a court or a party to a civil action that requires a witness to appear at a deposition in a civil action. It is typically issued by the plaintiff or the defendant in a lawsuit and requires the witness to provide testimony and records at a deposition. The subpoena may be served on the witness in person or by mail and must include a copy of the complaint or summons filed in the civil action. There are two types of Indiana AO 88A -Subpoena to Testify at a Deposition in a Civil Action: a subpoena ad testificandum and a subpoena duces tecum. A subpoena ad testificandum requires the witness to appear and testify at a deposition, while a subpoena duces tecum requires the witness to produce documents or other tangible evidence for use at the deposition.