I was at a Meijers a few weeks ago (midwestern chain kind of like Wal-Mart but nicer) and the self-scanner started flashing for the clerk when we finished. When the clerk came over, it played a video of me scanning one of the items, and the clerk could see if I had tried to slip something in the bag without scanning it. It was interesting to see.

It may have triggered because we’d bought alcohol, which had to be paid for separately in a special part of the store, and that was still in the cart. But I don’t know for certain what triggered it, and, if he knew, he didn’t say so.