I traveled to Mexico many times this year for work 3-8 day trips and almost always carried-on. As luck would have it the one day I checked bags I got a new agent in training that sent me through a USDA inspection and my bag was lost-actually, I suspect someone else grabbed my bag-Travel Pro 22” suiter and dropped it off for re check after customs. That caused an issue as I was ‘obviously’ hiding something.

In this case it was a training exercise that caused the extra screening.