Fine. Steal someone's mail, steal someone's vote.
It's the same thing, only it requires paper to do it.
You think you're making things safer. You're not.
You're only putting barriers in people's way.
Fraud prevention measures, unless they are very sophisicated and have professional staff to follow up on them, are usually not a problem for people who are intent on committing a particular fraud.
All the polling stations I have ever been to have been manned by people who volunteer.
If you want to put law enforcement at each and every polling place and have interviews with all voters, then talk to me some more. That's fraud detection.