As you seem to know, the prion example was to highlight how industrial scale operations create industrial scale problems, namely the bone-and-meal feed that was

As you seem to know, the prion example was to highlight how industrial scale operations create industrial scale problems, namely the bone-and-meal feed that was throwing all the cow brains into a common pool from which all were feeding. I understand that sanitary practices don't affect this. > It’s not dirty or unsanitary by any means I didn't say this and I don't know where you got it from.