In Canada, each person is assigned to a polling station, typically a school, church, or community center near their residence. You present ID at the door and your name is crossed off a paper list. Your name is not on the list at any other polling stations.

You have the option to mail in your vote or to vote in an advance poll, but these options close a week before the main poll, so if your name appears on the list at your polling station, they're pretty confident you haven't voted yet.