"Don't laugh it off so lightly. In Mexico they require: Photo ID's for voting, matched against photo on voter registration lists at each polling station. Indelible ink is applied after voting, thus assuring one vote only. Proof of citizenship is required prior to registration. We lack all of the above."
And if you think they're tough there, you should see their emigration requirements. /sarc
But I would take their immigration laws over ours.