Originally Posted by ani90

There is certainly no form of interrogation at UK airports, indeed at most European airports, akin to that the OP describes at AMS. At AMS officials trained specifically in US immigration screen all the passengers and check through all VISAs and requisite accompanying US documentation such as DS 2019, employment documents and the likes. These officers literally ask you questions, and examine the same documents, as a US border official would do on arrival to US. This is very different from, and is in addition to, the routine questions asked on any flight terminating in the US. This AMS screening takes place at the Gate in a designated area before the final security screen.