A New Jersey Subpoena Ducks Cecum Ad Testificandum is a court order issued by a judge or other judicial officer requiring a person or organization to appear in court to provide testimony, produce documents, or both. There are two types of New Jersey Subpoena Ducks Cecum Ad Testificandum: a deposition subpoena and a trial subpoena. A deposition subpoena requires a person to appear in court and provide testimony, while a trial subpoena requires a person or organization to appear in court to provide documents. The court order can also specify that documents must be brought to court, even if they are in the possession of another person or organization. The person or organization receiving the subpoena must comply with the order or be held in contempt of court.