> So for instance to make antibiotic-free chicken without a commitment to being antibiotic-free and organic, raise a bunch of chickens, take any who gets sick enough to need antibiotics and put them into a separate field with their antibiotics, sell the ones that happen to not get sick as antibiotic-free, sell the other ones as usual.

I think I'm ok with this. It means you can't routinely feed them all antibiotics, and people aren't eating chickens who had antibiotics.