An Illinois Subpoena for Deposition is a legal document issued by a court or other authority in Illinois for the purpose of gathering evidence or testimony from a witness in a legal case. The subpoena is issued to the witness to appear before a court or other legal body to answer questions and provide testimony related to the case. There are two types of Illinois Subpoena for Deposition: a Subpoena Ducks Cecum and a Subpoena Ad Testificandum. A Subpoena Ducks Cecum requires the witness to bring specific documents or records to the deposition while a Subpoena Ad Testificandum requires only the witness to appear and answer questions. Both types of subpoenas must be served on the witness in person and be properly filled out with the name of the court, the case information, the date of the deposition, and the name and address of the witness.