Damned police dogs, from what i've watched experienced and been told, it' a bit of a crap shoot, i've seen so many instances where either the handler had no idea of what the dogs meanings were, and just interpret it as drugs, or that the dogs are just prompted into giving false positives because hell, let's search him!
Either way though, fair play to that guy, quite an achievement. I have to say i've never quite understood the mentality that states your doing something very illegal, hell, wihtout even a license, so it makes sense to speed in excess.