Quick warning for anyone using the GE kiosk at YUL (and presumably other Canadian airports with CBP preclearance). I was accustomed to using GE at other airports in the US, but it works a bit differently in Canada.

You still head straight for the kiosk (2 at YUL as of yesterday, adjacent to NEXUS), but you must present your receipt to the CBP inspector at the passport control. This is different than in the US, where you bypass passport control altogether and just give the receipt after retrieving checked bags, probably because there are no CBP inspectors past the counter so immigration and customs checks are both handled there.

I was in a rush and walked ahead to bypass CBP altogether until I was barked at by a CBP officer.

But it's still nice to have the GE kiosks at YUL.