I recently found out the designated police pre-employment polygraph examiner for my area of the state uses one of those air mat pads to detect the anal pucker (someone posted a picture of one of these awhile back). Does anybody have any knowledge of how accurate these things are? I always assumed the pucker was the "king daddy" countermeasure and that it was safer to do than the tongue bite (which I cannot conceal, try as I might). If this device is effective, it would definetly seem like a credible threat to countermeasures. Any insights?

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Along with breathing countermeasures, that would appear to be my only option. I doubt Lafayette would market a product that is unable to do the sole thing it was designed for (although I don't know how that thing tells the difference between someone using the anal pucker or just shifting around in their chair. Maybe detected movement in sync with the asking of a control question???)

My only concern is that when I practice the mental countermeasures such as doing complex math in my head or imagining scary images, I do not feel frightened or nervous. That leads me to believe I'm not producing a reaction. Has anyone been able to produce a strong reaction based just on mental countermeasures alone?