STAND BY FOR A MAJOR CHECKPOINT POLICY CHANGE ANNOUNCEMENT FROM THE TSA BLOG:
Starting this week, officers will be asking passengers to put their shoes directly on the X-ray belt instead of in a bin at the checkpoint.
This will help to declutter bins and give officers a better view of shoes coming through, as well as everything else. Our officers are seeing some pretty packed bins with shoes, electronics, wallets and other items, and when they can’t get a good look, a cluttered bin is more likely to get pulled aside for additional screening. Nobody likes that.
If you don’t hear the directions or put your shoes in the bin by accident, fear not - you won’t be sent back to the end of the line for a do-over. - Evolution of Security blog
You won’t need to go back through the line because you misplaced shoes will be run immediately through a shredding machine! OK, I made this last part up.