[Swordmaker]

420 is also police code for marijuana
If is is, they borrowed it from SoCal kids in the eighties: 4:20 PM Time to get high after school.

It’s the other way around Chuckster. . . Police code first, time to get high second. School got out earlier than 4:20.

[bagster]

Some thoughts on the origin of "420."

The most credible story traces the date to Marin County, Calif. In 1971, five students at San Rafael High School would meet at 4:20 p.m. by the campus’ statue of chemist Louis Pasteur to partake. They chose that specific time because extracurricular activities had usually ended by then. This group—Steve Capper, Dave Reddix, Jeffrey Noel, Larry Schwartz, and Mark Gravich —became known as the “Waldos” because they met at a wall. They would say “420” to each other as code for marijuana.

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California Penal Code. Section 420 (misdemeanor)

Every person who unlawfully prevents, hinders, or obstructs any person from peaceably entering upon or establishing a settlement or residence on any tract of public land of the United States within the State of California, subject to settlement or entry under any of the public land laws of the United States; blah blah blah.....

Bagster de Califas.