Originally Posted by
Santander
Highly doubt it, if they wanted to they could have done it before when they manually looked at boarding passes. If wait times were becoming a serious issue maybe, but they've greatly improved in the last while.
At YYC, there are very verbose signs up about passengers not being allowed in to the trans-border area more than two hours before departure.
Of course, I've gone in as much as 2h30m before departure while connecting from YEG, so I'm not quite sure what the point of the signs are?