Full wings
Although the level might be classed as 'zero' it is a well known medical fact that the body produces (and always has present) alcohol. A 'zero' limit takes this into account.
Icepack
The Civil ATCO limits are the same as pilots... whatever makes you even think that they might not be?!! It would not be fair to have two different levels. Having an under the weather ATCO is as bad, if not worse than having an under the weather pilot!
I honestly do not think this is a battle you can win - random testing will come in. The ATCO unions have accepted it, how can you resist?? Strike action will not work - what would Joe Public think if he heard that pilots wanted to go on strike to resist random alcohol and drug tests (especially when the powers at be let it out of the bag that the rail industry, ATCOs etc are already subject to it). Good old Joe Public would just think that "overpaid pilots have something to hide".
It's not another step towards a nanny state - hell we have had pilots on this thread virtually saying that they would come in to work if they felt they were slightly under the weather, rather than risk the wrath of taking another sick day. That alone says the threat is a good idea.
We have had it in the UK ATCO side of things for a while now - I work at a major centre and cannot think of one person that has been tested - but we all know it is something that can be done - therefore we make sure we are legal, or we take a sicky and risk the wrath of the management for having too many days off.