ESPD 50 - Ethnopharmacologic Search for Psychoactive Drugs • 2017, In 1967, a landmark symposium entitled Ethnopharmacologic Search for Psychoactive Drugs was held in San Francisco, California. It was the first international, interdisciplinary group of specialists – from ethnobotanists to neuroscientists – who gathered in one place to share their findings on the use of psychoactive plants in indigenous societies. Follow-up meetings were intended to be held every ten years, but the War on Drugs intervened.