Comment by foerbert

Can't even downvote myself, but my guess is that it's related to the extremity of your position. It sounds a lot like you're saying since we know cyanide is poisonous by itself, it's very strange to be able to win a lawsuit if you find significant amounts of cyanide in your bread. Most bread is fine, right? So merely finding cyanide in it should only count as suspicion of a problem and not count as evidence... seems to be what you're saying.