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/
https://www.crimemuseum.org/crime-library/cold-cases/chicago-tylenol-murders/
