My father was in livestock pathology and always had a chuckle whenever spinach or (insert product here) would claim field contamination. His verdict: 9/10 it's

My father was in livestock pathology and always had a chuckle whenever spinach or (insert product here) would claim field contamination. 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.