by Mac Slavo, SHTF Plan:

About 75% of non-organic vegetables and fruits grown in the United States contain toxic pesticide residue. Blueberries and green beans contain organophosphates which can damage the human nervous system.

Unless produce is grown cleanly without pesticides and herbicides and is laboratory tested, it can be risky to consume to some degree because it might be chock full of hidden chemical poisons that are unseen to the naked eye, according to a report by The Daily Mail.