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In the custody of 2 customs officials, Dr Timothy Leary (centre) is led into the US Customs House following his arrest at La Guardia Airport. Dr Leary, the leading exponent of the use of the controversial drug LSD, was picked up when he stepped from a Toronto to New York plane under a section of federal law prohibiting users of narcotics or convicted narcotics violators to leave or re-enter the United States without permission..11 October 1966 (KEYSTONE/United Archives / TopFoto/Personalities)