If you are looking for hard to find stuff try Craft, Wine Emporium or Cru Bar. They have great selections and are often willing to chase stuff done for you.
It's not only a WHS issue (which you can change site to site) but also a privacy issue and also covered by separate Mining Safety legislation (which is state based).
They have to be dry, otherwise it's discrimination. You can't have one rule for the rank and file and another for the engineers/execs at head office when it comes to things like drug and alcohol testing.