. . it's more probable they're reserving the portion that can pass inspection for generation of foreign trade revenue. For instance, in the domestic market a lot of legumes are deliberately cut with grass pea, a legume that causes permanent paralysis upon overconsumption.
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The attraction of grass pea is that it grows well in areas that have too little rainfall for other crops. Paralysis from grass pea is still a major problem in parts of India. Since the people won't stop eating it, the Indian government is trying to develope and propegate non-toxic varieties.