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Terry Ball Polygraph is the oldest private polygraph company in Western Washington, operating continually for 40 years. It was opened in 1974 as "Gillespie Polygraph" by Dewey Gillespie soon after his retirement from the Seattle Police Department. Between 1974 and 1986, Dewey Gillespie operated the business with the help of other retired police examiners.
In 1986, Terry J. Ball bought Gillespie Polygraph upon Dewey Gillespie's final retirement to Arizona. Terry Ball has been operating the business since 1986 with the help of other professional polygraph examiners. Ball & Gillespie Polygraph offers professional polygraph services to law enforcement agencies, private attorneys, private businesses, and private citizens.
Our professionally trained examiners and our state-of-the-art equipment guarantee that you will receive the very best polygraph examination here at Ball & Gillespie Polygraph.  Don't settle for a poorly trained, inexperienced polygraph "operator" who will offer you discounted prices. When you need "only the very best" call Ball & Gillespie Polygraph.

Terry J. Ball, Chief Examiner

Terry Ball Polygraph, LLC

16825 - 48th Avenue West, Suite #218

Lynnwood, Washington  98037

(425) 775-9015




We are proud members of the following organizations:
Northwest Polygraph Examiners Association
National Polygraph Association
American Association of Police Polygraphists
British & European Polygraph Association

We also accept debit cards and check cards.