Contact Us

Our Polygraph Examiners have conducted thousands of polygraph tests and have brought their expertise from the New Hampshire and Maine State Police Forces to the private sector.

Our Polygraph Services

Diagnostic Polygraph Testing

The polygraph examiners at PRPA have decades of experience administering Single and Specific Issue Polygraph Examinations to formulate the best polygraph examinations possible.

More About Diagnostic Polygraph Testing

Pre-Employment Polygraph Screening

We use our years of professional interviewing experience and assist the applicant to overcome their anxieties and encourage honesty throughout the pretest interview.

More About Pre-Employment Screening

Post Conviction Sex Offender Testing

The goal of Post Conviction Sex Offender Testing (PCSOT) testing is to increase the public's safety by validating sex offender risk-assessment, risk-management and treatment planning decisions.

More About Post Conviction Testing

About Us

Michael P. Ranhoff

Michael earned a Bachelor’s Degree in Psychology from Providence College in 1975. He began his law enforcement career in 1980 when he joined the Arizona Highway Patrol.

He later joined the New Hampshire State Police and retired as a Detective Sergeant from their Major Crimes Polygraph Unit.

Continue Reading

Warren W. Ferland

Warren began his law enforcement career with the Hull, Massachusetts Police Department and was later hired as a Maine State Trooper.

He retired from the Maine State Police polygraph unit as a Quality Assurance Supervisor in 2014 and opened up his private polygraph business.

Continue Reading

Who We Work With


We provide Confidential polygraph examinations to help exonerate the innocent.

Probation & Treatment

Our Experts discover valuable information needed to maintain offender compliance.


PRPA Polygraph Experts help to bring closure by helping rectify personal and civil matters.

Public Safety

We administer pre-employment polygraph screening examinations to Public Safety Applicants.

Updates From Our Blog

Polygraph Examiner Warren Ferland Appointed to Maine’s Polygraph Examiners Advisory Board

Parlin and Ranhoff Professional Associates is proud to announce that their associate, Polygraph Examiner Warren W. Ferland was recently appointed by Governor Paul R. LePage to Maine’s Polygraph Examiners Advisory Board effective September 9, 2016. The Polygraph Examiners Advisory Board, as established by Title 5, section 12004-I, subsection 74-H, shall act as an advisory board […]

Continue Reading

Polygraph Ruled Admissible in Evidentiary Hearing

A Federal Judge has ruled that polygraph results are admissible in a criminal case. Recent research has shown that specific issue polygraph has a high level of accuracy.

Continue Reading

Differences between Screening and Diagnostic Exams

Our polygraph examiners at Parlin and Ranhoff Professional Associates have extensive experience administering diagnostic and screening polygraph examinations.

Continue Reading
“Warren is a thorough and trustworthy polygraph examiner. His attention to detail makes him unique in his approach and is second to none.  He is reliable, confidential and successful at what he does.”Mark A. Sperrey, Licensed Polygraph Examiner
“As a new examiner, I was extremely fortunate to be able to work with Warren Ferland during an internship.  Warren’s depth of polygraph knowledge, broad experience in the field, and overall professionalism are truly astounding.”Detective Sergeant Jason Rogers, Vermont State Police
"Whether it be Rhode Island, New Hampshire, Maine or Massachusetts ... this dynamic duo possesses many years of valuable polygraph experience which can only come through years of hard work."Scott W. Carline, Chief of Police, Forensic Polygraph Examiner, Mashpee Police Department
“I have personally dealt with Michael Ranhoff and Warren Ferland, both State of Maine Licensed Polygraph Examiners on hundreds of polygraph cases during my tenure here at the Academy… I would highly recommend any law enforcement agency to use their services.”John Rogers, Director of the Maine Criminal Justice Academy