I was told about 1971 by someone who should have known that gov had even back then a tech that could read paper snail mail WITHOUT opening the envelope.
If that claim were true, it seems logical that such mail-in ballots could be read and monitored for fraud. Just speculating.
The problem with fraud is it's not discovered or dealt with until after the election is over and a winner is declared.
My guess with mail-in voting is that a lot of ballots will never make it to the voters, but will still be miraculously counted - for the democrat candidate. No chain of custody, no proof. It's so obvious that they want to cheat, and yet, people thing mail-in voting is a good idea. I guess if you want the country to fail, then it IS a good idea.
Could POTUS, under the Emergency Declaration, move to protect the federal election by positioning military oversight in the Post office and at the “counting houses”, carrying through on Chain of Custody concerns?