Convicted Sex Offender Who Purchased Doug Williams’ How to Sting the Polygraph Passed Four Polygraph Examinations

On 21 February 2013, federal agents raided former police polygraphist Doug Williams‘ home and office, seizing his customer records as part of an investigation targeting polygraph countermeasure instructors. The U.S. government used these records to create a interagency watch list of individuals who had purchased Williams’ manual, How to Sting the Polygraph, an accompanying DVD, […]

Minnesota Appeals Court Rules Polygraph Results Inadmissible in Probation-Revocation Proceedings

In a 10-page published decision (PDF) filed on 23 May 2016, the Minnesota Court of Appeals ruled that “[b]ecause polygraph testing has not been proven reliable, polygraph test results are not admissible as substantive evidence of a probation violation in probation-revocation proceedings.” The case is State of Minnesota, Respondent, vs. Chad Michael Nowacki, Appellant.

Federal Appeals Court Rules Certain Mandatory Sex Offender Polygraph Questions Unconstitutional

The United States Court of Appeals for the 10th Circuit has ruled in a 25-page opinion (PDF) that a convicted sex offender in a post-conviction polygraph program cannot be compelled to answer questions about his sexual history that could tend to incriminate him. So-called “sexual history polygraphs” are commonly administered early in such programs, and […]

Polygraph Operator Ken Blackstone Pleads Guilty to Perjury

Georgia polygraph operator Ken Blackstone has pleaded guilty to a single count of perjury, a felony punishable by one to ten years’ imprisonment and a fine of up to $1,000 under Georgia state law. Blackstone committed perjury by falsely claiming during a court hearing that another polygraph examiner, Charles Slupski, had reviewed the charts of […]

Polygraph Operator Ken Blackstone Under Investigation for Perjury

Terry Dickson reports for the Florida Times-Union that polygraph operator Kenneth E. Blackstone of Atlanta, Georgia is under investigation for perjury in connection with a death penalty murder case: Guy Heinze Jr.’s polygraph examiner under investigation for truthfulness in court Posted: July 18, 2013 – 9:01pm  |  Updated: July 18, 2013 – 9:14pm By Terry […]

Chris French on Polygraph Screening of Sex Offenders

Professor of psychology Chris French writes for the Guardian on why mandatory polygraph screening of convicted sex offenders is a bad public policy choice. Excerpt: It is clear that offenders only have to spend five minutes on Google to realise that experts generally agree that polygraph testing is in fact not a reliable technique for […]