An Illinois Subpoena For Discovery of Documents is a legal document issued by a court in the state of Illinois that requires a person or organization to produce documents in response to a civil lawsuit. This document is a form of discovery, which is used to obtain evidence in civil cases. There are two types of Subpoena for Discovery of Documents in Illinois: a Subpoena Ducks Cecum, which requires the production of specific documents, and a Subpoena Ad Testificandum, which requires the appearance of the person or organization at a deposition to testify about the documents. Both types of Subpoena for Discovery of Documents must be personally served on the party or parties to whom it is directed.