I've finally managed to work through the links to get to the real substance of your post, which appears to be this:
http://www.whatdothey...inal%20reply.doc.html
I have always stated that the US authorities do not have 'carte blanche' access to UK criminal records. The letter from the Home Office states;
"The United States authorities do not have routine access to criminal record information held on the Police National Computer nor is the Police Certificate Process routine access to the PNC by the American Authorities".
Further I have always stated that the US can make individual requests for information. The letter from the Home Office says: "The United States authorities are able to seek details of any criminal convictions held on the Police National Computer on an individual request basis through Interpol channels".
I can't see that anything has changed there. Your original question related to applying for a B2 visa because you've accepted a caution for theft (which is what the US Embassy website, together the United States Immigration and Nationality Act, states that you must do). I repeat my original assertion that, if you do so, you might have a very long wait for a reply and may quite possibly get a refusal.
However the vast majority of people would probably simply 'forget' about their brush with the law and enter the USA under the Visa Waiver Program (by obtaining an ESTA). Several people on here have stated that they've successfully done exactly that (including one guy who wrote that he'd 'forgotten' about two drugs-related convictions, but who still had no problems with US immigration).
Chris