You're right- the polygraph is not admissible in court. It is however, a valid investigative tool. To that end the Ramseys and their attorney blocked investigation by those charged with that responsibility.
"To that end the Ramseys and their attorney blocked investigation by those charged with that responsibility." Hogwash! Was the investigation "blocked" when investigators refused to even look at the results of polygraph tests conducted by Gelb who is "considered by many to be the nation's foremost expert" and Baxter,"the founder of the CIA's polygraph unit who was referred to Wednesday as the father of the modern polygraph testing techniques."