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(Original Caption) 1/8/41-Washington, D.C.: E.A. Wildy (left), of the Treasury Secret Service, gives a demonstration of Uncle Sam's latest lie detector, using M.R. Allen, secret service agent in charge of Washington, as his subject, before the United States Secret Service Men's convention here. The device, which looks like a super portable radio, is called the Keeler polygraph. Three long needles record the pulse, heart action and skin reaction of the subject on a graph. If you are not telling the truth, Uncle Sam will find out through this little instrument.