A Missouri Criminal Subpoena is a court document that requires a witness to appear in court to testify in a criminal case. This document is issued by a judge and is legally binding. There are two types of Missouri Criminal Subpoenas: Subpoena Ducks Cecum and Subpoena Ad Testificandum. Subpoena Ducks Cecum is a court order that requires the witness to bring physical evidence to the court. This could include documents, photographs, videos, or any other physical evidence that is relevant to the case. Subpoena Ad Testificandum is a court order that requires the witness to testify in court. This type of subpoena does not require the witness to bring anything to court, just to appear and testify.