Government or official record
Tamper-Resistant Packaging Requirements
U.S. Food and Drug Administration
Where this source supports the record
Each entry separates the article’s editorial relevance note from its exact, section-level claims. A bibliography link without a direct claim is labeled plainly.
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Historic crimes & investigations · 29 September–October 1982Open article references →
The Chicago Tylenol Murders
Chicago metropolitan poisoning and investigation area · United States
Why editors use it hereOfficial regulatory history and requirements created after product tampering.
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Quick read
Beginning on 29 September 1982, seven people in the Chicago area died after taking Extra-Strength Tylenol capsules filled with cyanide.
Reviewed 26 July 2026 -
Trigger and conditions
Twelve-year-old Mary Kellerman died after taking a capsule; postal worker Adam Janus died later that day, and two relatives died after taking capsules from his bottle while grieving.
Reviewed 26 July 2026 -
Uncertainty
The deaths and cyanide contamination are established, but who altered the capsules, where, and why remain unknown.
Reviewed 26 July 2026 -
Why it matters
A small number of altered objects changed the physical language of nearly every medicine package.
Reviewed 26 July 2026
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Quick read