Obviously - but I wasn't talking about altering votes during voting hours. There would be no need. The same person could come back 20 times and mark off a different name each time and the people managing the booths wouldn't have a clue.
When I said the booth is opened I didn't mean just for the voters, I meant for counting after the ballot was closed as well. I know you stated that people could go from booth to booth multiple voting under an id.
How would they know what name to use? I suppose they could use their own. So they get 12 extra votes... the commission does make allowances for that sort of thing. And sometimes, not often, a ballot is taken again.
Oh and BTW branch stacking is when a party stacks their own branch not votes fraudulently in an election.
For starters the person in control of each booth knows how many people should be voting at the booth and all up in the election any noticeable variability would be questioned. I have already pointed out the only way you can really cheat an election.
Most ballots are not won by the odd vote... if they are they are usually challenged and a recount takes place.
You are supposed to vote in PENCIL. Because that is what they provide.
People counting ballots are watched by scrutineers from each party, mistakes in counting, challenges to invalids or even an attempt to cheat (by rubbing out and altering a number) would in all honesty be seen.
The ALP are known to have dead people vote for them. Even so there are not enough dead people voting to change the outcome of an election.