Do Lie-Detectors Lie?

The article presents information on lie-detectors. In accord with our modern era of technology and psychosomatics, we now have the "lie-detector," a device which is being used with increasing frequency by police laboratories on suspected criminals and their accomplices and by some government agencies on suspected Communists and "fellow-travelers." However, our talent for gadgetry has not left our sense of equity so far behind that we cannot still ask: What is this mysterious lie-detector? Does it serve any useful function? How trustworthy are its findings? What is their legal status? What is the lie-detector? The lie-detector is a relatively simple device for making a graphic record of a person's breathing and blood pressure while he is being questioned.