This Quick Reference Guide gives instructions on four popular methods, and at least one of them will be right for a given examinee.
Acquaintance tests have been used since the beginning of the polygraphy. There are many different types, and there has never been any research to determine which is the best. The best acquaintance test will be the one that achieves the goal of assisting in the discernment between truth and deception. That choice could vary by examinee, and there are instances when the examiner may choose not to use any acquaintance test at all.