I use AMS a lot as my daughter lives there. Am trying to envisage how this actually works with their system of not segregating inbound and outbound pax? If some arriving pax need extra security checks to transfer to another flight, how this actually achieved in practice, ie do some gates have local scanners to re-clear some pax?
It is done via a 3 layer system using different concourses. So Schengen is concourse B, C and part of D, clean non Schengen (which includes UK and USA) on concourses D (most parts), E and F and non Schengen-not clean. The latter end up on G and can be screen before going towards the other concourses if the arriving passenger isn't going landside.