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In page Truth serum:
"LSD was also considered as a possible truth serum, but found unreliable.[3] During the 1950s and 1960s, the United States Central Intelligence Agency (CIA) carried out a number of investigations including Project MKUltra[5] and Project MKDELTA[citation needed], which involved illegal use of truth drugs including LSD.[6][4][7] A CIA report from 1961, released in 1993, concludes:
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