USSSA has a rule change for 2004.
R8 Baserunning
4. A BATTER-BASE RUNNER IS OUT under the following circumstances.
G. When, after hitting a fair ball, and while the ball is still live, the Batter-runner carries the bat and touches first base or runs beyond first base while carrying the bat.
http://www.usssa.com/usssa/usssa-gen...1204.htm#rule8