A court, Grand Jury, legislative body, or Administrative Agency uses a subpoena to compel an individual to appear before it at a specified time to give testimony. An individual who receives a subpoena but fails to appear may be charged with Contempt of court and subjected to civil or criminal penalties. In addition, a person who has been served with a subpoena and has failed to appear may be brought to the proceedings by a law enforcement officer who serves a second subpoena, called an instanter.