Aside from increasingly using extra-judicial & increasingly arbitrary powers to snoop on us, it would appear that the police also been gifted a crime fighting sixth sense by some celestial higher authority (probably that piece of pondlife Peter Mandelson who it would appear is now running the country from his sun lounger in Cor-FU)...

An advertising campaign warning of the risks of driving after taking drugs is being launched in England and Wales. A TV ad will warn motorists that police can spot signs someone is under the influence of drugs if they are stopped

Is this the policing equivalent of Mummy knows if you’re telling fibs because you have black specks in your eyes? Not that I know a huge amount about these sorts of things but I’d have thought that it is a reasonably simple task to detect if a driver is less Casey Stoner & more well sort of stoned – just the usual tell tale signs, Bob Marley on the stereo, lots of jumbo Rizla packets on the dash & the rear seat covered in Dominos boxes