Will start a collection of resources. Shouldn't a vote be linkable to a SSN?
If so, detecting double voting would be simplistic
About 150,000 of the Georgia voters who requested absentee ballots for the June primary later showed up to vote in person, Raffensperger said. One thousand of them ended up casting a second ballot, and his office intends to investigate every case thoroughly, he said.
Raffensperger said his office is working with county election officials to ensure that no double voting happens in the November general election.
And maybe some won't nefarious, just weren't sure they could verify if their mail in ballot actually was received and counted.......