In recent weeks, we (the lay public) have been bombarded with media coverage (albeit little new information-perhaps a good thing) regarding John Mark Karr, an alleged suspect and confessor to the murder of JonBenet Ramsey.  He has allegedly independently provided information originally developed by investigators in this case and not yet generally (or perhaps at all) known to the public  (to include a potential innocent suspect(s)).  This, of course, relates to that concept which is variously known and referred to as concealed information, privileged information, or guilty knowledge.

I would expect that in addition to what has been willingly offered to date by Mr. Karr that would qualify as guilty knowledge, that there are additional (perhaps many stemming from a complex investigation) items/topics that would also qualify as such and which have not been discussed with nor disclosed by Mr. Karr.  This is an excellent opportunity for an instrumental diagnosis for the presence or absence of such information.  I would like to find myself in the unusual but often hoped for position of supporting a meaningful use of polygraphy in an investigation.  Perhaps this high profile case is that case and now is the time.  I hope so....

Now that Karr has been shown to be some sort of a sick glory-hound, why not not poly him and see what the machine brings him back as?  Don't do directed-lie CQT; do a straight-up CQT and let him answer as he will to every question.  Even though it's all a joke, it would be instructive to see how his answers come out...

Maybe if they twist and turn him enough, the FBI polyboys can get him to confess shooting Kennedy (both of them), too...