Examples from literature

• All of Mary’s victims apparently died from stomach illnesses, but in fact this condition has very similar symptoms to the deadly poison arsenic. 
• Arsenic could be used secretly and provided very little in the way of evidence. 
• By the 8th century CE, Arabian doctors had found ways to produce arsenic so that it was clear and had little smell, making it almost unnoticeable and very popular. 
• In the 19th century, arsenic was freely available and was often used as a cleaning product. 
• People said that Lucrezia Borgia kept arsenic in a special ring. 
• Substances like arsenic were commonly found in rat poison, cosmetics that women used, and cleaning products. 
• With her back turned, she opened the ring and secretly poured the arsenic into her victims’ drinks.