Thallium is a metal that was formerly used to kill rodents and is still used in the manufacture of electronics, pharmaceuticals, and glass. If ingested, it can lead to gastrointestinal problems, and then neurologic and cardiovascular problems. Patients often have extreme pain and muscle weakness. Ten members of two Iraqi families sought medical care for abdominal pain, vomiting, and difficulty swallowing. Later some developed nervous system symptoms. The two families had consumed the same, bakery-prepared cake. Since this could have been an intentional poisoning, a criminal investigation was conducted. Prussian blue is a remedy for Thallium poisoning. Thallium has not been used as a rodent killer in the USA since it was banned for this purpose in 1975.