Loved the idea of TSA not forgetting to put the lock back on due to the key needing to be used.  However our experience was that they removed the lock to inspect the suitcase, took the key out of the lock and didn't know how to lock it back up so they put the lock in the suitcase and zip tied the zippers together.  Now we have a lock that can't be locked because the TSA didn't know how to use it.