As one of those 3200 foreigners checked on that occasion, I can tell you the officers were not as friendly as my previous encounter. They asked for my passport, which I luckily enough had with me, recorded my details, and remained absolutely stone faced when I asked what it was about. Though it was just one operation, it still made me feel uncomfortable not knowing why I was being asked to prove who I was. I understand that it’s the law, but it’s just not one I’ve become accustomed to. Fortunately, this was the only time in eight years I’ve been spot-checked, so I presume it’s a rare occurrence.