An Illinois Subpoena-Subpoena Ducks Cecum is a legal document issued by a court, typically in Illinois, which orders a person or entity to appear in court and produce certain documents or items related to a case. A Subpoena Ducks Cecum requires the recipient to bring documents or other tangible evidence to the court. There are two types of Illinois Subpoena-Subpoena Ducks Cecum: A Subpoena Ducks Cecum Ad Testificandum, which requires the recipient to appear in court to testify on behalf of a party; and a Subpoena Ducks Cecum to Produce, which requires the recipient to bring certain documents or items to court. In either case, the recipient must comply with the order or face legal consequences.