I was impressed with what I saw in that link and couldn't resist sharing the YouTube video where you see it from a different angle.
I think, if possible, it's even more impressing when you see it up close, but you also get to see how the one shown in the first link (that according to other info I've read, isn't a fully trained police-dog yet) haven't quite learned when to "shut off" yet and bites one of the "good" persons. http://www.youtube.com/watch?v=LbD3qzMcJxA
I think it shows a very correct picture of how difficult it must be for a police-dog to know what to do and when etc.