"Spotlight" on the Voice (Channel 7), page-34

The AEC won't do a thing. They should name and shame anyone who votes more than once.

If memory serves in the 2016 Federal election there were about 14 electors who voted more than once in the Herbert electorate and seat was won by a similar margin.

Of course it could never be proven who these people voted for but it does call into question the integrity of the system.