Ray.  You mean to tell me that if I tell the truth on the control question and get a reading of lets say 0, then tell the truth on the relevant questions I also get a 0 this would mean I would pass?  The way I understand it was that the control question are probably lie questions in which the examiner tries to get you to lie in order to compare this results with that of the relevant.  In other words, you want the reaction on the control questions to be higher "as if you are lying" and lower on the relevant (hence the purpose of counter-measures).  An example of a control question would be "have you ever lied to someone important to you?".  Well of course everyone has so if you say no then you lied and if you say yes the examiner says. "Other than what you have told me..."  Again, its impossible to list every single person in your whole 25 years of life that you have lied to.  Let me know if this assumption is not correct Ray. Thanks