An Illinois Subpoena to Appear and Testify at a Hearing or Trial in a Civil Action is a legal document issued by a court or a party to a lawsuit. It requires the person named in the document to appear in court or at a hearing or trial, and to testify in the legal proceedings. In Illinois, there are two types of Subpoena to Appear and Testify: a Subpoena Ducks Cecum, which requires the named person to bring certain documents or records to the hearing or trial; and a Subpoena Ad Testificandum, which requires the named person to appear and testify. Both types of Subpoena must be served on the person named in the document in accordance with Illinois law. The person must be given at least three days’ notice of the hearing or trial, and the Subpoena must be returned to the issuing court or party with a proof of service. If the person does not appear in response to the Subpoena, the court may impose fines or other penalties.