Why do you find it impressive? I have a distinct feeling they know much more then this... I'd be surprised if they didn't have by now a file of at least half of them. What we've seen is simply competent police work, nothing more. The police are trained, paid and well funded to do exactly this kind of thing... I'm really not surprised to find it worked for once.

I am surprised though to see it public. In the good ol' days this would have been handled much more discreetly.