About that time...  

Today in Jim Leitzel's Regulation of Vice class someone brought up the fact that today is 4/20, and people were wondering where the significance of the number 420 comes from. I had always heard that it was the police code for a marijuana-related infraction (like 187 for a homicide), but then I started thinking that there must be different codes for different jurisdictions, since there are different laws.

Anyway, it turns out this business about a police code is a myth. Instead, the term seems to have originated with a group at San Rafael High School in California and has something to do with a statue of Louis Pasteur...