- Politico 2020-10-23 Pennsylvania Supreme Court says ballots can’t be rejected based on signature comparisons
- Los Angeles Times 2020-10-28 ‘Ripe for error’: Ballot signature verification is flawed — and a big factor in the election
When performed by professionals in criminal cases or legal proceedings, signature verification can take hours. But election employees in many states must do the job in as little as five seconds. [...] In 2016, mismatched signatures were the most common reason that mail ballots were rejected, according to federal officials. With record numbers of people voting by mail this cycle, ballots thrown out for signature problems and other issues have the potential to decide races where the margin of victory is slim.
That's the last one, I won't add any further updates.
NPR.org's More Than 550,000 Primary Absentee Ballots Rejected In 2020, Far Outpacing 2016 mentions:
Most absentee or mail-in ballots are rejected because required signatures are missing or don't match the one on record, or because the ballot arrives too late.
In the US is signature matching done for most or all mail-in ballots? Is it also done for in-person voting? Is it judged simply by any random volunteer, or only by someone "skilled in the art"? Is the same person who checks the signature also the one who counts the vote, or is signature rejection vote-agnostic?