After seeing the American Experience excellent production of Deborah Blum's wonderful book The Poisoner's Handbook on my local PBS station, I was interested to stumble upon a 1921 ad from The American Magazine for Rough on Rats.
Rough on Rats' active ingredient was arsenic, and it was responsible for a number of (intentional and unintentional) poisonings during the years it was available to the public.
Watching the program it struck me just how easy it was to get away with poisoning in the 20's. Poisons like arsenic were easily available to just about anyone and forensics hadn't advanced to a point where the cause of death could be determined with any degree of certainty. All that was required was motive and enough fortitude to maintain a plausible alibi. It makes you wonder just how many killers got away with murder.
I highly recommend the book as well as the television adaptation, both are great and tell the story of just how bad things got in the United States before regulation and investigation put an end to the poisoner's reign.
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