Ex railway so I was also subject to this procedure and don't regard it lightly.

As far as I am concerned if you turn up for work with traces of drink or drugs then you are rightly out - but there is another side too

And just how many accidents have been directly attributed to drugs/alcohol?
Ahhhh....thought so

BOTW raises an interesting point,

Just about all regulations are reactionary - ie in response to a previous occurance - and often over the top...

So where did this one come from?

PS, on a tangent, one EU state with a reputation for copious consumption of alcoholic beverages is planning to reduce its driving limit to 20/100 this year... no doubt there will be a job fest for chauffeurs as a result :E