Hate to beat this to death but this is the case I remembered that keeps me out of the picking business.
One of the most sensational cases was the local Oregon poisoning of Amanita phalloides that occured October 22, 1988 (see Readers Digest, July 1989, pp. 43-48). A Korean woman had picked mushrooms that looked similar to ones that she used to pick as a child in Korea. Isun Pak had mistaken the deadly Amanita phalloides with what she thought were edible Paddy Straw mushrooms (Volvariella volvacea). Out of five people that had eaten these mushrooms one evening, four received liver transplants and will take medication for the rest of their lives, and one was seriously ill, but recovered fully and didn't have to receive a transplant.