Signature verification is supposedly the cornerstone of mail in ballot security.
It is basically a joke in the first place for several reasons, the first if which is the simple fact that actual handwriting analysis takes years to learn and is normally done by people with degrees in the sciences in the first place.
Anyone that thinks a bunch if volunteers were adequately trained in time to allow for any real level of proficiency in this for this election and the massive expansion of this is nuts, making the supposed safeguard largely ineffective
Add to that that some security measures were actually removed in some states and we end up with the shit show we have.
Im not de facto opposed to mail in voting, but getting there is a process that takes years, not a snap reaction to a virus. We were not ready for this by any stretch of the imagination for this election.
There is more to it...
The person requesting a ballot has to be registered, their home address they put is the same on file and the signature matching, WHEN it is Requested, then the ballot is mailed to them, is my understanding. So a set of checks to request the ballot, then the set of checks when the absentee ballot is cast.
And part of the check in addition to signature and address, is that the person voting absentee ballot, had to have requested a ballot.... this stops counterfeiting....
Also, a count of all ballots mailed out is taken, and then a count of all ballots received as casted votes... this prevents more ballots being returned, than mailed out. That would be caught....
Then when the absentee envelopes are checked and pass muster, they are counted again, the good ones, and ballots are removed for machine counting of candidate votes, a count of total ballots counted by the machines, has to match the total amount of absentee envelopes counted, that met muster....
This PREVENTS ballot dumping and claims of such...because a bunch of ballots can't just be printed and filled out and snuck in to be counted.... you CAN'T HAVE more ballots than envelopes returned....
And even more different checks....