I have two UK passports. On one i have a valid ESTA, on the other i have recently travelled to Sudan. Will US CBP know details of travel in both passports? I ask this as from 21/01/16 an ESTA is no longer valid for people to have been to Sudan since 2011.

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    It's worth noting that you are no longer eligable for the VWP - it's whether you have visited the countries on the list, not your passport. Of course,a s the related question shows, its another question if they know about it. As a UK citizen though you're about the least likley to get away with it (given the amount of information sharing between the US and the UK)
    – CMaster
    Feb 1, 2016 at 13:47
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    @CMaster Why would UK authorities be aware of the visit to Sudan? Even if passports contain some high-tech magic, it's not like that they are automatically transmitting stamps put into them by foreign immigration officers to the issuing country. Feb 1, 2016 at 16:39
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    Well there are lots of ways that the UK government could know - especially if you took a flight from the UK to Sudan. If there is any attempt made at logging the travels of UK citizens made though, I have no idea.
    – CMaster
    Feb 1, 2016 at 16:46
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    It boggles my mind that you would even be considering doing this. America is not known (and I am a citizen and resident as well) for 'taking it easy' on people it thinks may have suspected "ties to terrorism"... Yes, you could probably get away with it, but what do you do if/when the US Government finds out you intentionally broke the rules? At the least they'll likely deport/ban you, the worst? Try sending a letter to an inmate at GITMO? What inmates in GITMO, you ask? Exactly.
    – CGCampbell
    Feb 1, 2016 at 19:38
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    Thanks for the feedback. My trip to Sudan was for legitimate business that I can evidence so I think I will now apply for a visa. Feb 2, 2016 at 14:29