[just another ref]

You know what? The more I wrestle with this question, the more I think that it (like a lot of other test questions) is
really a non-issue. If a dribbler is in a normal posture dribbling the ball and steps on a line, the whistle will go off quick enough that he will not have time to put up his hands and make a show of not dribbling again. The official in this case probably will not actually know (or need to know) whether the dribbler touched the ball and the line at the same time or not. If the dribbler loses his footing, even slightly, and touches the line, even though the ball may be close at hand, I think we have an interrupted dribble. In this case, not only would touching the line not be a violation, the dribbler would be allowed to step back in bounds and resume his dribble. I would have to see the play, ("Ball games are not played on paper, they are played inside television sets." Kenny Mayne) but I think I have been converted.