Because groceries are the same high margin items, that are hidden in sophisticated ways?

> are hidden in sophisticated ways?

Yes, they are in fact hidden even better. How do you see that bananas contain banned pesticides or that meat contains banned antibiotics?

You take a sample of a charge and test it.

If it contains forbidden substances you fine the importer.

Most grocery chains in Germany with the exception of Edeka (I guess it's similar in other countries) apply stricter standards than the legal limit anyway with their suppliers, and ensure compliance by testing on their own

How is Edeka different? Honest question.