An Illinois Subpoena is a legal document issued by an Illinois court that orders a person or entity to appear in court to produce evidence or to testify in a case. It is a binding order from a court that requires compliance. There are two types of Illinois Subpoenas: Subpoena Ducks Cecum and Subpoena Ad Testificandum. Subpoena Ducks Cecum is a court order that requires a person or entity to bring specified documents and other tangible evidence to court. It usually applies to someone who is not a party to the case but who has information pertinent to it. Subpoena Ad Testificandum is a court order that requires a person to appear in court to testify. It usually applies to someone who is a party to the case or who has knowledge of relevant facts. In order to be valid, an Illinois Subpoena must be signed by the court clerk, contain the name of the court and the names of the parties, be served to the person or entity in question, and include the date and time of the court hearing. Non-compliance with an Illinois Subpoena can result in fines or imprisonment.