Pennsylvania Subpoena (PDF) is a legal document used in the state of Pennsylvania to compel a witness to appear before a court or other tribunal to provide testimony. It can also be used to request documents and other materials that are relevant to a case. There are two main types of Pennsylvania Subpoena (PDF) documents: Subpoena Ducks Cecum and Subpoena Ad Testificandum. A Subpoena Ducks Cecum requires a witness to produce documents or other tangible evidence, while a Subpoena Ad Testificandum requires the witness to appear in court and provide testimony. Both types of Pennsylvania Subpoena (PDF) documents must be served on the witness in order to be valid.