In which decade were child-resistant prescription bottle caps first mandated by law in the United States?

The pharmaceutical industry has implemented numerous safety measures over the decades, with packaging innovations playing a crucial role in medication safety. One of the most significant developments was the child-resistant prescription bottle cap, which has prevented countless accidental poisonings since its introduction. Test your knowledge about this important medical packaging innovation that changed how medications are dispensed worldwide.

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1950s, following post-war chemical industry expansion
1970s, after passage of the Poison Prevention Packaging Act
1980s, as part of Reagan-era FDA reforms
1990s, following a major lawsuit against pharmaceutical companies