homework,

It's possible that you were suspected of using countermeasures, as polyboy1 opines, but it's not necessarily the case. The silent answer test may be used as a counter-countermeasure, but it may also be used in an attempt to minimize movements not suspected as being countermeasures. In any event, movement during the relevant questions is a pretty stupid countermeasure.

If you were strongly suspected of using countermeasures, I would expect that you would have received a post-test interrogation in an attempt to get an admission. But that doesn't seem to have happened in your case.

polyboy1,

You allege that I attempted countermeasures "on two separate occasions with two different, unrelated agencies." Where did you hear that?