Polyreject,
It is a mistake to conclude that because your polygrapher told you he thought you were trying to manipulate the results, and you had in fact employed polygraph countermeasures, that your polygrapher had necessarily "detected" your countermeasures. Recall that, as you mentioned above, your polygrapher also apparently thought you had been moving your feet, when in fact you hadn't. Accusations of countermeasure use are not uncommon, and numerous individuals who did not even know what countermeasures are have been wrongly accused of such (myself included).
To date, no polygrapher has demonstrated any ability to detect the kinds of countermeasures outlined in
The Lie Behind the Lie Detector. There are no articles or book chapters in the polygraph literature that explain how to detect such countermeasures, and the available peer-reviewed research on countermeasures suggests that even experienced polygraphers cannot detect them at better-than-chance levels of accuracy. Under the circumstances, it is perhaps not surprising that Dr. Drew C. Richardson's
polygraph countermeasure challenge has gone more than three years now without a single taker. For further information, see pp. 156-162 of the 4th edition of
TLBTLD (beginning with the subchapter "Can't Polygraphers Detect Countermeasures").
While it is not clear precisely what criteria polygraphers may be using to make accusations of attempted countermeasure use, I understand that there is a maxim amongst polygraphers that "if a reaction looks too good to be true, it probably is." It is possible that if reactions to "control" questions appear to the polygrapher to be "too big" that countermeasure use may be inferred. But again, documentation is wanting. For relevant discussion, see the message thread,
Lies in The Lie Behind the Lie Detector.
As for why some suspected that you might be a polygrapher, there is a precedent of polygraphers forging posts on this message board. Examples include:
thevet2/checking (who also posted in this thread as "darkcobra2005")
AnalSphincter/LoopyLuWho usarmyofficer2004 PolySucks/Cancerman Policeman nopoly/POLYSCORE Zena/Boy_Wonder