>What I want to know is if the US have full access to
>the police national computor and the UK fingerprint
>database?
Do you really think this is likely?
Just igonre your past crime and visit the USA as though it never happened.
If you admit it, and go to the embassy, and they say no, then you will never get in.
(I must admit, I quite like to see people who have committed past crimes, particulalry related to drugs, suffering some sort of "penalty" later in life for doing so, but in your case it was a long time ago and I think you have served your "sentence".)