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Psychoactives, War, and Covert Operations
Timeline
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1931
Research on the barbiturate sodium pentothal (the proverbial "truth serum") begins.   

J. Stephen Horsley at London Hospital notices that patients treated with the barbiturate Nembutal appeared to lose their inhibitions and share very personal information. Interested in this phenomenon as a possible aid to psychotherapy, he continued experimenting with sodium amytal and sodium pentothal.


References
Streatfeild, D. Brainwash. St. Martin's Press. 2007.


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