Visa Waiver Program In USA: which uk law database do they search - can they find arrests even without convict?

do the USA border control search the uk criminal records bureau, or an even more complicated system which has details of arrests etc?

Answer:
There's all sorts of weird stuff on it now, I understand. However, an arrest is hearsay, so unless it is an arrest making it seem like you might be a terrorist I'd be surprised if it gave you trouble.
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