Remember that the job of polygraphers is to extract confessions. In many ways, the whole examination is a complex ruse to trick you into confessing something.
Change your breathing pattern when a control question is asked. You can make it faster or slower, hold your breath for a couple seconds after an exhalation, or breathe more shallowly. Do this for 5-15 seconds and return to your normal breathing pattern before the next question.
Be aware that your every move is very likely being observed from the moment you arrive at the testing location. There may be hidden cameras in the waiting room and the restrooms, and there is almost certainly a camera or two-way mirror in the polygraph room. Your polygraph examination begins long before you are hooked up to the machine and ends only when you’ve left the testing location.
