I'm really wondering what checks and balances are in place.
I understand for instance that the ballot boxes are not checked in the polling stations themselves. Instead, they are transported to a central location within a constituency, opened and checked.
The boxes are supposed to be transported from the polling stations to this central location by an official "election" vehicle. Sometimes private entities/people are contracted to provide this service.
The problem is that there's the possibility of tampering/switching he boxes during that transport phase.
If I remember correctly during the last General Election there was some controversy involving one of these official transport vehicles. It was discovered somewhere in Ste. Madeline with ballot boxes in it's trunk.
I cannot recall what became of the matter though.
In any event, I hope that proper systems have been put in place to deal with weaknesses in the system this time around.