It's not inconceivable that parts of various animals will make their way into one's combine-harvested grain/etc though is it.
Nanograms of field mouse dust ending up in your cous cous is a bit different to the intentional addition of (say) offal during production.
@hanged_up started
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Nanograms of field mouse dust ending up in your cous cous is a bit different to the intentional addition of (say) offal during production.