A District of Columbia Subpoena Ducks Cecum (also known as a subpoena for production of documents) is a legal document issued by a court or government agency ordering a person or organization to produce certain documents or records to the court or agency for use as evidence in a legal proceeding. It is typically issued in civil or criminal cases. The types of District of Columbia Subpoena Ducks Cecum are: 1. Subpoena Ducks Cecum ad Testificandum: This type of subpoena requires the recipient to appear in court or before a government agency to testify and/or produce documents. 2. Subpoena Ducks Cecum ad Testificandum et Produced: This type of subpoena requires the recipient to appear in court or before a government agency to testify and/or produce documents, but also requires the recipient to bring specific documents or items with them. 3. Subpoena Ducks Cecum ad Hacienda ET Produced: This type of subpoena requires the recipient to attend court or before a government agency to testify and/or produce documents, and also requires the recipient to perform some specific act, such as providing a deposition.