Polygrapher's DETECTION is a job that involves the use of a polygraph machine to detect lies. The term can be broken down into three parts: 'polygrapher, ' which refers to the person who operates the machine; 'DETECTION, ' which refers to the process of detecting lies; and 'LIE, ' which is a three-letter word. Polygraphers use the machine to measure physiological responses, such as changes in heart rate, respiration, and blood pressure, to determine if someone is telling the truth or not.