Of course it's possible that someone will put an address that may have been the second-last or third-last place they lived, or their parents' house. Maybe they feel more of an affinity for a riding than they do for the last place they lived. We could do something like have people swear an oath to say this is the proof of the last place they lived. They would be legally responsible for the information they've given you, and if they're found to have violated that, they'd be in a whole lot of trouble. We could do something like that.
I don't think you can completely eliminate the possibility. I don't think you can completely eliminate the risk that some people could possibly have a reason to put down something that isn't their last place of residence. All we can do is encourage honesty, as we do every other time we ask Canadians to be honest about things, whether on their tax forms or on their passport application—things like that.
The reality of it is we're not going to put every person who lives abroad through top secret level clearance where we make sure we know exactly where they lived last. There has to be some trust in this or else we're not going to be able to do it.