I am flying DXB-YYZ-EWR with a 7 hour layover in YYZ. I am a Canadian citizen and will have checked luggage. Can I exit through Canadian customs and then enter US customs and immigration landside later? In the past this would not have been possible as US baggage was collected as a special/separate carousel (IIRC) but this is no longer the case with baggage being checked through but was not sure if it would cause any issues. Thanks!