The other thing we don't often think about in relation to reports such as these is the fundamental question regarding how much of the offending substance is necessary to actually pose a significant threat.
There was some research done quite a few years ago that I read about in a reliable venue that had tested potatoes (the kind we eat every day) and found them toxic to the lab subjects. If you read farther into the article you discovered that the quantities consumed were equivalent to a human eating something like 5 pounds a meal, 3 meals a day for x # of weeks!
You'd have a bunch of other problems long before whatever alleged toxicity had a chance to develop.