An Illinois Subpoena-Subpoena Ducks Cecum is a legal document issued by a court that requires a person or entity to appear in court and produce documents or other tangible evidence. The subpoena can be issued by a state or federal court in Illinois, and it is often used in civil and criminal proceedings. There are two main types of Illinois Subpoena-Subpoena Ducks Cecum: Subpoena Ad Testificandum and Subpoena Ducks Cecum. Subpoena Ad Testificandum requires the recipient to appear in court to give testimony or provide documents. This type of subpoena does not require the recipient to bring any physical evidence to court. Subpoena Ducks Cecum requires the recipient to produce documents or other tangible evidence before the court. This type of subpoena is typically used to provide evidence for a criminal or civil trial. The recipient must bring the requested documents or other evidence to court to be presented to the judge.