An Illinois Subpoena Ducks Cecum is a court-ordered legal document that requires a person or entity to produce specific documents or other tangible items as evidence in a legal proceeding. There are two different types of Illinois Subpoena Ducks Cecum: a witness subpoena duces tecum and a deposition subpoena duces tecum. A witness subpoena duces tecum requires the recipient to appear in court and testify, as well as produce the requested documents or items. A deposition subpoena duces tecum requires a recipient to appear in a deposition and produce the requested documents or items. In either case, failure to comply with an Illinois Subpoena Ducks Cecum can result in serious legal consequences.