Polygraphic - Last session`s subject

In the last session I learned about the polygraph and its use in criminal investigations. A polygraph is an piece of equipment usually used usually by police divisions in order to detect if the suspect is lying. How does it work? The person has to be hooked up to the equipment, through wires and sensors, after that, the polygrapher expert starts making asking questions about many subjects, including those regarding tothe supposed crime and the polygrapher measures the body's responses, such as breathing intensity, heart rate biting, blood pressure and so on. Every All the information is displayed/showned up on a computer screen, and it is up to the polygrapher to analyze the graphics and figure out decide/determine if the suspect is who the person they are looking for, or not.