[merrylander]

Canada uses paper ballots, or did when last I was there, when the ballot boxes are opened there are representatives from each party present to observe the process. Unless there was some sort of collusion I should think deliberate markup of a ballot to nullify it would be difficult.

Here we used to have a mark sense ballot that used black markers, then it went through an optical reader. I trusted that a damnsight more than the computer we have switched to as there is no paper trail.