An Illinois Deposition Subpoena in a Criminal Case is a document issued by a court of law or the prosecuting attorney in the state of Illinois. It requires an individual or organization to appear and give testimony in a criminal case. There are two types of Illinois Deposition Subpoena in a Criminal Case: a Subpoena Ducks Cecum and a Subpoena Ad Testificandum. A Subpoena Ducks Cecum requires an individual or organization to produce documents, records, and other tangible items relevant to the criminal case. A Subpoena Ad Testificandum requires an individual or organization to appear and testify in the criminal case. Both types of Subpoenas must be served to the individual or organization in accordance with Illinois law.