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The Exact Spot Where ‘420’ Became Slang for Weed

There is a wealth of modern folklore about the origin of the term “420” and its connection to weed culture. But despite the myths, it isn’t a California police code, nor is it Bob Marley’s birthday (he was born in February) or the number of active chemicals in marijuana.

Of the many origin stories for the term 420 as code for all things herbal, the most credible traces back to 1971, to this statue of Louis Pasteur on the campus of San Rafael High.


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