I was at TPA a few days back and when I got in the BW line, the agent told me that they weren't using the BW because the 2nd scanner wasn't working. This doesn't comport with my experience regarding how other airports use the BW, but I just got in the long line. The second scanner def. adds a wrinkle of confusion to the equation. At other airports with one scanner the reach across works fine, but with 2 scanners and one used for BW, there is bound to be confusion.