At the time of the July 2016 federal election, around 15.7 million names were on the electoral roll, some 14.3 million of whom turned out to vote. They either voted in person — on election day or beforehand — or by post, and between them they cast 13.5 million formal lower house votes.
In the weeks following the poll, the Australian Electoral Commission scanned all the paper printouts of the roll and found 18,343 people whose names had been crossed off more than once. In September that year they sent a letter to each of these apparent multiple voters.
The AEC does this after every election. In 2013 the number was a little higher, at 18,770.
Is 18,343 “multiple voters” a lot? How many of them were fraudulent? Should it worry us? How do we stop it happening?