They became illegal right around then. 60 Minutes brought in 3 lie detector firms and told them one of several employees had stolen some camera equipment. In reality nothing had ever been stolen. Each of the firms fingered a different perp with 100% certainty and advised them on how to fire the person without getting sued. CBS caught all that on hidden camera and broadcast it. There was a bill in the hopper in the House the next day to ban lie detectors.
Thanks-