The issue when it's people is it let's parasites enter a lifecycle which isn't complicated. Human feces is more likely to have parasites infectious to humans
Right but apparently that doesn't kill me. The question is what happens to industrial runoff in the water stream and if that has any effect on food safety.
His verdict: 9/10 it's rat feces at the processing or packaging plant.
But from a marketing perspective, field crop contamination is an act of God. Can't be helped.
Plant contamination would actually mean someone was at fault. And would require (expensive) changes.