Which pharmaceutical packaging innovation was widely adopted in the 1970s specifically to prevent child poisonings and is now required by law in many countries?

The medical industry has seen remarkable innovations in product packaging over the decades, particularly for pharmaceuticals. These changes weren't just aesthetic - they've addressed critical issues like patient safety, medication adherence, and accessibility. This trivia question focuses on a groundbreaking pharmaceutical packaging development that revolutionized medication safety standards worldwide.

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Child-resistant (CR) closures/caps
Blister packs with aluminum backing
Tamper-evident seals
Unit dose packaging