In the 1980's there was no wrap on the Tylenol bottle, or a cover on it to let you know it had not been tampered with. Unfortunately that did not work in some peoples favor.

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Sources:

https://en.wikipedia.org/wiki/ChicagoTylenolmurders

https://www.chicagomag.com/Chicago-Magazine/October-2012/Chicago-Tylenol-Murders-An-Oral-History/

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