Comment by zorked

In Brazil there is black box testing. Party officials can choose a sample of a few ballots per polling location on election day, where a simulated election is run, with all inputs recorded on video. The machines have to tally the right votes for the input given at the end of day. These are machines that would be used for voting, and the party officials are parties unrelated to (and in a way, antagonistic with) the voting authority.

I think it's a pretty solid scheme.