The original title is:

> U.S. Postal Service Failed to Properly Handle Some Ballots During This Year’s Primary Elections, Audit Finds

> …deficiencies in how ballots were tracked and errors leading to delays, all of which risked ballots having incorrect postmarks or otherwise arriving late to election officials, which could lead to their rejection.

This is one reason why mail–in ballots should all be barcoded. The USPS would scan the barcode each time the envelope was handled generating a history that shows how it made its way through the postal system. The history of any ballot that arrived late could be examined to find out where the postal system failed.