The notice in bold print says....appointment required....then goes on to say...Non-US citizens must have an appointment. Usual redundant and unnecessary verbage. One would think if an appointment is necessary....an appointment is necessary.
Not so, it is completely impossible that anyone that is American could commit any crime. It can only be us dirty foreigners.
I used to fly with a Turk. He went to the US on a short stay visa, then overstayed for 3 years before marrying an American and getting his green card. He even looked like a stereotypical terrorist. However when we went through immigration together he would regularly get waved through because of his green card, while i would get the third degree. This would happen almost daily.