Australia and Canada. Read the classified listings in Canadian newspapers for truck drivers and you'll find pre-employment testing is mandatory. In fact, I think the mining industry has similar requirements.

It's just astonishing that applicants fail. But as observed in the cycling context, you'd have to be dumb to get caught doping.

And as to the national drug testing company, not sure. Take a look at the cycling scenario, yet again, to see how things can be fudged to make things look better than they really are.