A California Motion to Quash and Memorandum is a legal document used in California courts to challenge the validity of a subpoena. A motion to quash is a request made to the court to invalidate a subpoena, asking that the court order the party who issued the subpoena to withdraw it. A Memorandum is an argument detailing why the motion should be granted. There are two types of California Motion to Quash and Memorandum: a motion to quash a subpoena duces tecum and a motion to quash a subpoena ad testificandum. A motion to quash a subpoena duces tecum asks the court to invalidate a subpoena that requires a person to produce documents or tangible evidence. A motion to quash a subpoena ad testificandum asks the court to invalidate a subpoena that requires a person to appear and testify in court. Both types of motions must explain the legal grounds for why the court should quash the subpoena and must be accompanied by a memorandum that provides additional legal arguments.