一位因性攻击被定罪的犯人在假释时做测谎试验。检查人员问:“你曾经说过谎吗?”这个男子说“:没有”。这时,测谎仪的针头仅仅有规则地运动着。当然,你可能猜想这家伙在说假话,但今天所用的测谎仪却不能。它们所能记录的脉搏、呼吸、皮肤温度和其它信号,只能提示某人在回答一个非常不利的问题时似乎有些紧张。机器可能被愚弄,但它不会总是那么傻。 A convicted prisoner for sexual intercourse conducts a polygraph test on parole. Inspector asks: “Have you ever lied?” “The man said ”: no ". At this point, the polygraph’s needle moves only regularly. Of course, you might guess that this guy is lying, but the polygraph used today can not. The pulse, breath, skin temperature, and other signals they can record can only suggest that someone seems nervous in answering a very negative question. The machine may be fooled, but it will not always be that silly.