How interesting..I think alot of those are reading physical body reactions like heart rate, breathing , pressure and body language interpretation too..hard to fake that stuff unless your pretty zen.
Do they teach how to interrogate females too? I imagine it's a different approach and style??
If I asked you did you kill that guy? And you repeatedly think "Did I kill Guy Fieri?" and really focus on your question before saying "No" while imagining Guy Fieri alive and well, your body will not always respond with heightened blood pressure, heart rate, breathing, etc. Because you're not lying. Polygraphs are a tool and not a great one. The best poly examiners are actually the ones who get to the truth, the machine is just a prop, the average to crappy examiner relies on the machine.
I learned how to interrogate anyone and everyone, then spent years in the field putting it to use. Then I worked for and trained with people who did not have to comply with the Geneva convention and found their methods to be a little more effective. Everyone's breaking point is a mystery and you have to press buttons and pull levers until you find it.