The Tiahrt Amendment is a provision of the U.S. Department of Justice appropriations bill that prohibits the National Tracing Center of the Bureau of Alcohol, Tobacco, Firearms and Explosives (ATF) from releasing information from its firearms trace database to anyone other than a law enforcement agency or prosecutor in connection with a criminal investigation. This precludes gun trace data from being used in academic research of gun use in crime. Additionally, the law blocks any data legally released from being admissible in civil lawsuits against gun sellers or manufacturers.