On December 14, 1955, Darrel Parker arrived at his Lincoln, Nebraska, home to find his wife, Nancy, strangled to death. Although their house was broken into less than a month earlier, the police were unable to find any leads, so their attention turned to Parker. To make their case, the authorities relied on a private interrogation by polygraph operator John Reid of Chicago. Reid's company, founded in 1947, today provides interviewing and interrogation...