pailryder wrote on Jun 25^th, 2011 at 12:42pm:

If one defines a properly executed cm as one that is not detected, you are of course correct.Just like a properly excuted bluff in poker is defined as a bluff that is successful.This post points out the risk of detection for less than perfect execution.

I concur that if somebody is haphazard in the execution of a countermeasure, it could very well show up on the chart as an anomaly detectable by the examiner; practice and refinement are paramount.