[rogator]

Two questions.
Can't we do the same with their voter signatures?
Can we find out if our vote has been tossed out?

[Splatter]

Yes to your first question.
As for your question, "Can we find out if our vote has been tossed out?", I don't know. Can anyone else answer this?

The only way to avoid the "invalid signature" scam is to go to the elections office before voting and fill out a new voter registration form. If you have changed your signature you may be outta luck. I know mine has changed over the years.