Last I heard US does not have access to UKs PNC/Criminal records, not unless you flagged up for some reason or someone ran a more detailed check.

Once US border control find your lie to them its a criminal offense as in enough to block you from US travel. Remember US is the worst place to travel to if you have criminal convictions in fact they class even being arrested as an criminal offense one wonders considering the place is one giant prison perhaps they don't want more criminals entering the place !

Check here these guys may know more detail:

https://www.travellerspoint.com/forum.cfm?thread=22639&start=521#Post526

I think the subject of canada sharing records with us is mentioned also...

worth posting and asking still.

Goodluck mirrorman and le us know if you did get through !

imo I think an actual prison sentence of more then 12 months is the lesser of 2 evils, but police arrest or cautions or warnings should not suggest a criminal offense, so I do like Australia stance on anyone with 12 months or more imprisonment however technically they should have none since its things like that which go against the human rights act (law) which clearly states one should have the right to work and put food on the table !