I wish I had comments as interesting as Aaron Haspel's
My knowledge of arsenic poisoning comes nearly entirely from the experience someone I know had when he was poisoned by his Russian mail-order bride. He gave a colleague a sandwich prepared by his beloved and, when that colleague became terribly ill, the colleague was tested for arsenic poisoning. When the colleague tested positive, he too was tested and found to be have abnormally high blood levels of the stuff. Apparently, the sandwich was to be the coup-de-gras.