"We don't really have any that protect the food supply from farm to table. We have a food safety system that's piecemeal, largely divided between two agencies that don't talk to each other very much. Neither agency can enforce regulations from the farm to the table."

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FDA, which regulates the safety of vegetables, doesn't have those kinds of rules because Congress doesn't want it to. It's not that the vegetables themselves have anything wrong with them; it's that they're contaminated with animal manure. One of the rationales for a single food safety agency is that you can't separate animals from vegetables.

— Marion Nestle