Thanks god that i'm not in America,polygraph in my country
is limited to the intelligence aspects & from my readings &
interest in intelligency aspects i believe that my country's
intelligent services aware of the invalidity of polygraphy
coz we beat other agencies lie detectors,so we can use it
but not totally depend on it to prevent our security violation
     I want to ask something can polygraph used only to
detect responses only from suspected persons to know if the person has direct relation to specific action,not in the formal form but in the truth seeking only about sensitive information
related to classified information with reasonable confirmation?
    & can the person falsely gives no response intentally to the subject he really know,or things he really did?
    & how the person can psycologically give response to the
control Questions & isn't it exhausting or distract the attention from the questions asked by the polygraphor?
   i really sorry for this long questions,i really respect this
   well organized respectable forum
                                                      Peace