Polygraph machines of this vintage were used by the RCMP Security Service since their development in 1974. Prior to that time, the various models of polygraph machines used around the world were strictly pneumatic. A model similar to this one was purchased by CSIS in 1985 when the Service implemented an in-house polygraph program for both administrative and operational applications. It was used continuously until 1994 at which time the Service switched over to digital or computerized polygraph technology.
This analog polygraph machine was used to determine whether a person was telling the truth.