HERE WE GO AGAIN !.
Yes the USA has access to the UK PNC Computer.
The NSA (National Security Agency) can check it's computer in seconds if not minutes
Yes the USA does check passport details against a criminal record database.
Yes the USA has the right to put you on the first plane back home.
THINK ABOUT IT : Your on a flight with a convicted terrorist, drug dealer, people trafficker, rapist, child kidnapper, the list is endless...and all he or she has to do is tick a box to get in ?.
Doh !...I don't think so.
You wanna share your tranatlantic trip with Bin Ladens brother in law who just got released.
RING THE USA EMBASSY AND GET THE FACTS.