I left Canada to the US by train, my passport was not scanned.?
There are four (4) countries, as far as I know, that do not put an exit stamp. Those countries are the United States, Canada, Republic of Ireland, and the United Kingdom. The purpose is to not cause the traffic congestion upon the departure. However, the passport must be at least scanned upon the departure to notify the authority whether you left the country via land/sea/air. It does not make sense for me in this regard to how the authority manage their archive upon the departure. I saw a YouTube video clip of a guy who shipped himself in a small container from the UK to France, passing through the English Channel undetected. Both countries are the European Union, but they are not ratified under the same border policy. He reached France within 3 weeks period, and decided to book a train ticket back to London via Gare du Nord. My questions are as follows: How does British authority know that he left the UK? He should face a complicated question of no record leaving the UK upon his return home. How does French authority know that he arrived in France? He should face a complicated question of no record entering France upon his departure out of the country. I still do not understand how both British and French authority keep track of his undetected movement.