Attention foreign visitors
Please note that entering or leaving the US is an issue of severe controls.
A few questions of the security officers at the airport of departure - a severe radar control at arrival - put your shoes in the luggage box as well - fingerprints and a photo of your smiling face at the entrance of the US - those prints and picture must match whenever leaving this state of bees and honey.
Slogan : Keep America's doors open and their Nation secure. I think they are right.
PS : This picture is not the official in/out immigration pass through - so please do not duplicate - it has no sense