Re: If Exams are unworkable online,
The serial number on the ballot paper is recorded when issued to a voter, so a determined entity can find out how an individual voted. This is why ballot papers are usually destroyed after an election.
Sounds bad. In Finland., the ballot is just a folded piece of paper, with a printed circle inside which you are supposed to write your candidate's number. The official record nothing when handling one to you from a pile.