An Illinois Subpoena in a Criminal case is a legal document that is issued by a court or other government agency in the state of Illinois to compel a person or organization to appear in court, provide documents, or testify. There are two types of Illinois Subpoenas in a Criminal case: Subpoena Ducks Cecum and Subpoena Ad Testificandum. A Subpoena Ducks Cecum is an Illinois Subpoena in a Criminal case that requires a person or organization to produce documents or other records to the court. The materials must be relevant to the case and must be produced in a timely manner. A Subpoena Ad Testificandum is an Illinois Subpoena in a Criminal case that requires a person to appear in court and testify. This type of subpoena is usually issued when witnesses have information relevant to the case or when a witness is needed to provide testimony. Both types of Illinois Subpoena in a Criminal case must be served in person on the person or organization that is being subpoenaed. The person or organization must also be given a reasonable amount of time to comply with the subpoena. Failing to comply with a subpoena can result in fines and other penalties.