Twilight Threshold

In the mid to late 1950s, moreover, the work of military scientists was marked by a noticeable paradigm shift in the chemical warfare field, from developing fast-acting nerve agents for maximum lethality to seeking 

Beecher s caution in discussing US research objectives was mirrored in British attempts to downplay the relevance of the problem. While leading 

I am sure that you wiU recognize the implications which might be drawn should it become known, generally, that [the] Cl A or the Military InteUigence Agencies are directly concerned in this matter, even though this concern stems primarily from the defensive aspect of the problem.  

LSD had first come to the attention of Porton s scientists after discussion in the published literature of its effects on patients . In March 1953, prior to Beecher s visit, the enzyme panel of the CDAB summarized its pharmacological mode of action. Whereas some psychologically stable subjects. 

The MoD maintains that none of the servicemen, many of whom received several doses, were placed under stress or suffered any ill-effects. 

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