The Senate passed S. 397 by a 65-31 vote on July 29, 2005 and then by the House by a 283-144 vote on October 20, 2005.?? Enactment of the ??Tiahrt Amendment.?? This amendment protects gun owners?? privacy by prohibiting the release of firearm trace data to any entity except a law enforcement agency conducting a bona fide criminal investigation involving the firearm.?? Enactment of a tax exemption