Actually, I wonder how is that possible?
I mean, how is it possible for them to contaminate the food with
feces and urine without the customer smelling anything??
Why don't you guys try an experiment; by some food, any kind of
dish, stir some crap into it or mix some piss into it. I'm sure
straight away the smell will change - it will be awful because of
the food smell and smell of human wastes.
No way to be undetectable.
only thing that can be undetectable is saliva. And this really
eeeww me out already... 
