Testing food for poison

One or two morsels of the food are set aside as an offering; if it is poisoned, flies that settle on it and crows that eat it soon die. Thrown into fire, poisoned food crackles and gives off unbearable smoke blue as a peacock's neck, and its flame breaks up. A footnote describes the custom of setting morsels aside for crows before eating and calls it permissible for Jains too.