The Gom Jabbar
The Bene Gesserit made extensive use of the Gom Jabbar, especially when they tested the humanity of certain individuals. In such circumstances, the device was placed against the subject's neck and acted as a deterrent for them backing out of the test. Such a method was used by Reverend Mother Gaius Helen Mohiam against Paul Atreides before his arrival on Arrakis.
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