That's a good idea. They would count the signatures of the voters in the register and call it in to the Elections Office.
Oops, just read #106. Forgot they couldn't count.
Yes, of course there are the sign-in logs. Who has custody of those books? That could prove who voted that day at the very least. The people who got turned away never reached the sign-in books or did they? IS THE TURNING AWAY UNTRUE? Once you're signed in, you get to vote?
What you can't measure is if Janet finds people who alleged they were turned away BEFORE they could sign in. Those could be votes that Janet could try to mine before Tuesday. Even if they were at home on their couches all day Tuesday. You see what I'm saying?