wrote on Jun 2^nd, 2003 at 7:34am:

Whether detected, or undetected, countermeasures do harm.

Public Servant,

I think your point has perhaps even more validity than you posited. Knowledge of the CQT test technique itself potentially reduces its effectiveness even with no countermeasures utilized since it is unlikely a person will react as strongly on the controls. For that matter if they do react it liklely would be out of concern that they might underreact rather than concern of being detected as deceptive on the control. This all gets rather messy and one can't help but wonder how the polygraph community handles this. Ask examinees if they are knowledgable of polygraphy and if they are switch to a DLT?  I don't think knowledge about polygrapy itself is a ever a "relevant" D/Q ing question, but it sure can alter the assumptions polygraphy is based on.

-Marty