An Illinois Subpoena Ducks Cecum is a type of legal document issued by a court or other authority in the state of Illinois. It requires a person or business to produce certain documents and/or records, such as documents related to a pending court case. The documents must be produced in a timely manner. There are two types of Illinois Subpoena Ducks Cecum: Civil and Criminal. A Civil Subpoena Ducks Cecum is issued in civil court cases and requires the production of documents or records related to a civil matter. A Criminal Subpoena Ducks Cecum is issued in criminal court cases and requires the production of documents or records related to a criminal matter.