A serial killer who has never been caught changed the way Americans consume over-the-counter medication, after they sent the nation into widespread panic with their sick killing scheme.The poisoning murders of seven residents in 1982 horrified the country - and the world at large - because they involved Tylenol, the best-selling non-prescription pain reliever at the time.The killer had opened the capsules and replaced some of the acetaminophen with potassium cyanide then quietly returned them to the shelves.
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