Instead officers say they're still checking drivers by getting them to do things like stand on one leg and walk in a straight line.

BBC: Newsbeat - Health - Drug-driving tests not ready

Whether it was checking in at Gatwick, on my 10 hour flight, or standing in the two hour immigration line at Las Vegas's woefully inefficient McCarran airport, I found myself on the end of a series of pitches.

BBC: CES: The selling starts