A Tennessee Grand Jury Subpoena is a legal document issued by a court to compel a witness to appear and testify before a Grand Jury in Tennessee. It is also used to require the production of documents, books, and records that may be relevant to an investigation. There are two main types of Grand Jury Subpoenas in Tennessee: a Grand Jury Subpoena Ducks Cecum, used to obtain documents, and a Grand Jury Subpoena Ad Testificandum, used to require a witness to appear and testify. Both of these types of Grand Jury Subpoenas are issued by a court at the request of a district attorney or other law enforcement authority and must be served upon the witness or custodian of records in order to be legally valid.