In 2004, a Republican congressman from Kansas,
Todd Tiahrt, a long-time ally of the NRA, added an amendment to bill regarding the bureau of alcohol, tobacco, firearms and explosives (ATF). Until that point, data had been kept on the history of guns used in murders and shootings, which allowed police and policymakers to trace them back to corrupt dealerships and other holes in the system. The rule change,
known as the Tiahrt amendment, made this data much harder to acquire. It also forced the justice department to destroy within 24 hours the records of any gun buyer whose background check was approved. The overall impact of the amendments was to make it much harder for police to clamp down on illegally distributed guns.