Polygraph, Lie detector: What do infidelity polygraph tests work?

Infidelity, fidelity or cheating polygraph tests are a common practice in most countries.

However, most couples do not really know what can be done in a polygraph test, what questions to ask or what a polygraph test actually can do or not.

This video explains what is normally investigated in an infidelity polygraph test and what is important to know when hiring a professional polygraph examiner.