The illicit drug habits of America's high school students have been tracked by a group of researchers at the University of Michigan since 1975. The Michigan drug researchers have "never seen such a dramatic drop in the use of an established illicit drug as they're seeing now with LSD." According to this Slate article, there are two reasons for the decline in LSD use. First, in November 2000 the DEA arrested two Kansas men who were responsible for 95% of the country's supply of LSD. Second, Jerry Garcia died, the Grateful Dead stopped touring, and LSD's distribution system disappeared.