In 1982, Tylenol, made by Johnson and Johnson, was the leading pain-killer medicine. They held 35 percent of the market share. Sadly, there were seven mysterious deaths via poisoning within a short time in the Chicago area. Detectives put the details together, realizing the source of the poisoning was from extra-strength Tylenol purchased from five different Chicago stores. Someone had tampered with the product and laced the tablets with potassium cyanide.
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