It should certainly be possible.True. There's a law that seems to have had very little impact on how people behave. I'm surprised that, with today's technology, it doesn't seem to be possible to automatically pick out people travelling at driving speeds by the variation in their signal and the speed at which they are transferred from one antenna to the next.
The problem is that a phone moving at "driving speeds" while making a call does not imply that the person using it is breaking the law. It's perfectly legal for a passenger in a car to use their mobile phone while it is moving. IIRC it's also perfectly legal to use a phone with a hands free kit while driving.
