Pucker up! You might be able to beat a lie detector test!
A man by the name of Doug Williams who is a former police officer and a certified polygraph examiner says there is a way you can cheat the test with one simple movement. That movement… clenching your anus. Yes, you read that right…
After a session with a friend discussing the “technique” he decided to put it to the test.
“After he left, I just hooked myself up to the polygraph test… and tightened up my anal sphincter muscle like I was trying to stop my bowel movements and low and behold there was the most gigantic, wonderful, naturally occurring cardio rise, accompanying a GSR rise.” (mamamia.com.au)
Translation… he says it causes issues and makes the test unreliable.
You can read more about the “science” behind it, HERE.