This is the exact spot where '420' became slang for weed.
Of all the rumored origin stories for 420, including a California police code, Bob Marley’s birthday (he was born in February) or the number of active chemicals in marijuana, it is this Louis Pasteur statue that is the most likely source.
A group of San Rafael High students, in California, met for weeks at this statue at 4:20 p.m. to go on a treasure hunt for some fabled area weed. Their code word? "4:20 Louie."
To read more about the 420 origin story and how it spread into ubiquity: https://trib.al/5sRyTCt