This should be of concern to natural bodybuilders as well as those who have used anabolic steroids. Polygraph "testing" has never been shown by peer reviewed scientific evidence to operate at better than chance levels of accuracy under field conditions. Moreover, this pseudoscientific procedure has a well deserved reputation for falsely accusing many innocent people for every correct detection of deception.

Those of you who have trained hard for this or any other show that requires competitors to submit to this foolishness should check out AntiPolygraph.org . AntiPolygraph.org is a non-profit website dedicated to elimination of polygraph "testing" because of its inherent unreliability.
The Lie Behind the Lie Detector , a free book which can be downloaded from the site, explains the trickery behind polygraph testing, and provides detailed information on how to pass the "test" whether you answer truthfully or not.