Employment Polygraphs


Offering pre-employment polygraph examinations for local, state, and federal employees or contractors who are working for these groups and have access to sensitive or privileged information.

Law Enforcement Polygraphs


For those working within the legal system, a polygraph test can assist in the process of vetting out the statements of suspects, witnesses, plaintiffs, and parties involved in civil proceedings.

Sex Offender Polygraph Testing


Order post-conviction sex offender polygraph testing (PCSOT) for both treatment and monitoring purposes, for parolees or registered sex offender treatment follow-up. Get in touch to find out more about this service.

Stacy MacFarlane

When The Truth Matters

A Polygraph Examiner You Can Trust

With over 30 years of Law Enforcement experience, Stacy MacFarlane knows how important it is to know the truth. Whether you need to test a job applicant, those involved in criminal or civil matters, or even someone you are involved in a personal relationship with, you want to know the truth. Using his investigative experiences, the latest examination practices, and the most reliable equipment, Stacy will get results.

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Polygraph Services In California

While you may only associate a lie detector test with the criminal investigations depicted in movies and true-crime TV series, Tri-Valley Polygraph located in Livermore, California also provides professional polygraph services to individuals, law enforcement, attorneys, governments, businesses, and corporations. Polygraph tests are valuable in a wide variety of situations where determining truthfulness is paramount.

Polygraph Examinations

All of the polygraph examinations adhere to the best practices set forth by the American Polygraph Association (APA). PCSOT exams follow the standards set forth by the State of California Sex Offender Management Board.

American Polygraph Association
Marston Polygraph Academy
American Association of Police Polygraphists
National Polygraph Association
California Association of Polygraph Examiners