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The Single Convention enters into force
The treaty took effect once forty countries had ratified it. Through the 1960s and 1970s most governments rewrote their drug laws to match, which is why so many national prohibitions date from these years.
Checked. The date and the event were compared with a source that was read.
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International agreements are listed for context. They bind governments, not people, so they move no country's score by themselves.