In The Case for Forensic Polygraph Testing in Post-Adjudication Sexual Offender Examination and Management, polygraph expert witness Ken Blackstone writes:
The Problem
Polygraph examination is a catch-all term used to describe the use of the polygraph instrument, either as a forensic tool to determine the veracity of a statement or as a utility tool to generate statements and disclosures. While these two approaches are superficially similar their foundations are not.
Law enforcement agencies use polygraph to support investigation of criminal matters and attorneys use the polygraph both for establishing direction in their cases and to present as evidence in an upcoming proceeding. Whether the polygraph examiner conducts a forensic examination that is reliable or a utility examination that is undependable is often unknown to the agencies and attorneys involved.
Ken Blackstone is an expert regarding polygraph examinations. He is the author of the book Polygraph, Sex Offenders, and the Court (2011, Emerson Books ISBN 978-061-5506-80-7). www.blackstonepolygraph.com