Oklahoma Subpoena (OK) is a legal document issued by a court or other authorized entity in the state of Oklahoma. It requires the recipient to appear in court or produce documents or other evidence related to a legal matter. There are two types of Oklahoma Subpoena: Subpoena Ducks Cecum and Subpoena Ad Testificandum. Subpoena Ducks Cecum requires the recipient to appear in court and produce specified documents or objects. Subpoena Ad Testificandum requires the recipient to appear in court and give testimony. Both types of Oklahoma Subpoena must be served on the recipient in person or through certified mail. Additionally, if the recipient fails to comply with the subpoena, they may be subject to criminal or civil penalties.