Earlier quoted context omitted.
Any ballots that are cast under same-day registration are cast as provisional and will go through the full verification process if the election is close enough where those ballots are necessary. Source: actually ran a fucking election precinct. Non-citizens aren’t casting ballots illegally.
I'm not talking about same day registration. If you are on the rolls and proof of citizenship is not required to register, then how do you as a poll worker know the person on the rolls is a citizen?
Also just generally it's a severe federal crime to vote illegally, so people who are here illegally aren't out en masse publicly tying their identity to federal felonies.