Which innovative pharmaceutical packaging design feature became widely mandated in the 1970s specifically to prevent child poisoning incidents?

Pharmaceutical and medical device packaging is a critical component in healthcare delivery. Beyond protecting products, packaging design in medicine serves crucial functions related to safety, compliance, and usability. This trivia question explores a significant packaging innovation that revolutionized medication safety standards and became mandatory across the pharmaceutical industry.

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Child-resistant caps (push-down-and-turn mechanism)
Tamper-evident seals with visible breaking indicators
Blister packs with individual dose compartments
Color-coded warning labels with pictographic hazard symbols