alt Hacker NewsInteresting. In Canada, for federal elections at least, you're assigned to a specific location and station. You can't vote anywhere else. There's a separate process for mail in ballots to confirm you didn't vote in advanced voting or on election day as well.
Same in the US.
You can try voting again at other stations, especially since they don't require ID. You just need the name of somebody assigned to that station, who hasn't already voted. There is a signature check if there is a suspicion, but that's rarely done.
But that's practically never done. The risks are too high, and to have a significant impact would require enough votes to make it certain you'd get caught.