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.
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