Thallium poisoning is pretty well known in the United States as well, due people watching TV or movies. For example, I watched an older episode of the show Elementary last night in which the antagonist poisoned two scientists using thallium. He put the thallium in food and drinks, including milk, like guy from the article. Watson was able to recognize the symptoms immediately and described thallium as a common choice for poisoners because it is colorless, odorless, and tasteless.