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| Part of the Hippie movement | |
 An Acid Test handbill | |
| Date | 1965-1966 |
|---|---|
| Location | California, Texas |
| Part of a series on |
| Psychedelia |
|---|
The Acid Tests were a series of parties held by author Ken Kesey primarily in the San Francisco Bay Area during the mid-1960s, centered on the use of and advocacy for the psychedelic drug LSD, commonly known as "acid". LSD was not made illegal in California until October 6, 1966.