Pensioner admits testing homemade poison ricin on neighbours at US care home | World News | Sky News
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Former Massachusetts biotech firm director searched for deadly poisons online, bought 800 castor beans to extract the lethal toxin ricin, feds say - masslive.com
Guide to Poisonous Plants – College of Veterinary Medicine and Biomedical Sciences – Colorado State University
Guide to Poisonous Plants – College of Veterinary Medicine and Biomedical Sciences – Colorado State University
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What is ricin, found in a package addressed to the White House? – KIRO 7 News Seattle