QuoteThis individual was unusually responsive on the polygraph. His reactions were so pronounced that it is believed they can be definitely isolated and for this reason it is believed that the conclusions are unusually reliable. As a result, it is believed that he was deeply involved in the espionage ring and in direct contact with Doctor Pfeiffer. It is not believed from the questioning that he personally took Lonkowski over the Canadian Border. It is believed that his present cooperation with the FBI Agents is sincere up to a certain point but that he is still withholding much information concerning his own complicity in the espionage work.
QuoteGrieble [sic] was not placed under any bond because he was thought to be helping the prosecution in this case; several times he had been placed under the lie detector and had been found to be lying.
QuoteQ.--Are you double-crossing the agents?
A.--No.
Q.--Are you sincere in present efforts to assist Federal agents?
A.--Yes.
QuoteIn connection with these reports, your office is cautioned that due to the inherent limitations of the method and apparatus no action should be predicated solely upon the results of the tests nor should the same be considered in the determination of prosecutive action. Subject to this limitation it would appear, however, that these tests were particularly successful on several of the subjects insofar as indicating the possession of further undisclosed information on the part of some and unreliability of at least one.
QuoteThe first FBI use of the polygraph in espionage was in 1938. Leon G. Turrou, an FBI agent was fired by FBI director J. Edgar Hoover for botching the case and letting too many German agents escape.