George and Skeptic,

You refer to this test as a peak of tension.  A peak of tension test is constructed such that the deceptive person is lying to one and only one item.  

In this case, however, a person might be deceptive to one, several, or all relevant questions.  It is actually a form of relevant/irrelevant test and should be evaluated that way.  That is, any consistent, significant reaction to any specific question – in the absence of any plausible explanation which has been verified by additional testing – would indicate deception.  It’s a tough test to beat.

Peace,

Gordon