Originally Posted by
fly2lanai
The US immigration/Custom Opens exactly at 4:30am though the check-in counter is open much earlier than that. So once, you finished checking-in , you have to hold on your checked luggage(tagged) and wait in line for the immigration/custom to open..
Not anymore. At YYZ T1, your checked baggage will be taken at the check-in desk now, and you go through security before going through US pre-clearance. The US CBP officer will scan your boarding pass and ask you to confirm a photo your luggage on screen. This also occurs for Global Entry and NEXUS members after using the kiosks.