A District of Columbia Subpoena In A Civil Actions Case-For Attorneys Only (3 Identical Copies Required) is a legal document issued by a court in the District of Columbia that requires an individual or business to appear in a civil action court case. A District of Columbia Subpoena In A Civil Actions Case-For Attorneys Only (3 Identical Copies Required) is also used to compel the production of documents or other tangible evidence for use in the case. There are two types of Subpoenas: Subpoena Ducks Cecum, which requires the production of documents or other tangible evidence, and Subpoena Ad Testificandum, which requires the appearance of a witness at trial. In both cases, three identical copies of the Subpoena must be served upon the party or witness.