June 3, 1876: Fairgoers visit the Turkish Hashish Exposition at the Centennial Exposition in Philadelphia, where many partake.

May 29, 1969: The Canadian government forms the Commission of Inquiry into the Non-Medical use of Drugs, which ultimately issues the famed LeDain report, recommending that simple possession of cannabis and cultivation for personal use be permitted. The report contradicts almost all of the common fallacies held by some of the general public. During an interview in 1998, LeDain blames politicians for the fact that virtually none of the commission's recommendations were made into law.

May 30, 1977: Newsweek runs a story on cocaine reporting that "Among hostesses in the smart sets of Los Angeles and New York, a little cocaine, like Dom Perignon and Beluga caviar, is now de rigueur at dinners. Some party givers pass it around along with canapes on silver trays... the user experiences a feeling of potency, of confidence, of energy."

May 28, 1994: President Clinton's appointed director of the Drug Enforcement Administration, Thomas Constantine, says in a Washington Times interview: "Many times people talk about the nonviolent drug offender. That is a rare species. There is not some sterile drug type not involved in violence -- there is no drug user who is contributing some good to the community -- they are contributing nothing but evil."

May 31, 1996: Psychedelic guru Timothy Leary dies.

June 1, 1996: Actor and hemp activist Woody Harrelson is arrested and charged with cultivation of fewer than five marijuana plants, after planting four industrial hemp seeds in full view of Lee County Sheriff William Kilburn in Lexington, Kentucky.

May 31, 2000: Lions Gate Films releases Grass, the Woody Harrelson-narrated/Ron Mann-directed documentary about the history of marijuana in 20th century America.

June 2, 2004: Judge Paul L. Friedman of the US District Court of the District of Columbia strikes down a law passed by Congress blocking marijuana law reform groups from purchasing ad space in public transit systems. Judge Friedman notes that the federal government cannot ban certain types of speech because it disapproves of their content -- especially in light of the government's own advertising advocating for the punishment of marijuana users on these same trains and buses.