Love the little anecdote at the end...
This is quite scary! It will not be long before the UK starts this too.
They actually already have 'voluntary' drug testing for motorists in some parts of the country as one of those Sword of Damoclese type *temporary trials*. It's a kind of litmus paper they swipe on your forehead. Detects grass and amphetamines all at once!
But the whole *voluntary* road-side test scenario just makes me crease up with laughter... Imagine the scene... You have just been stopped for a minor traffic mistake, or just the usual "He looks a bit dodgy.. let's pull him over on the pretense of blah blah blah".
They can't find anything to pin you down on so...
Then....
"'scuse me Sir. Would you mind taking a *voluntary* drug test please?"
"No, sir! Why ever not...?"
"Got something to hide have we sir?"
"Perhaps we should take you down the station for a more thorough test if you won't do the *voluntary* test, Sir!"
Absolutely hilarious! Voluntary my arse!!!