Richard Kettlewell

"Something more complicated": for the most part I delegate judgment to Coeliac UK, who do diligent research to see what products are safe for me to eat. I don't know how much of their judgment is based on qualitative considerations like whether there was gluten in the same factory or not, but I know that at least some of their judgment is based on doing actual chemical tests to see what things really do have gluten in them at the end of the process. Every so often they disqualify some foodstuff as a result of improving their test procedures.

"Any accidental contamination": I take armb's point about potentially being a bit uncomfortable if I knew a whole person had fallen into the sausage machine, but I don't think that's an ethical objection; my ethical objection to eating people is that I would not wish to cause or encourage any person's death or mutilation for the purpose. I imagine I would be unwilling to eat a large amount of human after a sausage-machine accident, but that would be for pure ick reasons rather than ethical ones: would it taste weird, would it carry human-transmissible diseases, would there be BRAAAAINS involved.