The Tiahrt Amendment was first added by Todd Tiahrt (R-KS, after whom it is named) to the 2003 federal appropriations bill. It was signed into the law as part of this bill on February 20, 2003. It was subsequently broadened in October 2003 with the addition of two provisions banning the ATF from requiring gun dealers to inspect their firearm inventories and requiring the FBI to destroy background check data within 24 hours. In 2004, it was altered again, this time to limit access to gun trace data by government officials, and to ban the use of such data in firearms license revocations or civil lawsuits.
