It is clearly a PLT (CQT) test. He has probably broken one or more laws since his last test or at the very least has to think long and hard about it hence Q3 is the control question.

It's a good thing he tokes up, drives fast, or goes through stop signs at times or he could have well showed a greater reaction to the molesting questions. Virtually everyone is assumed to have "broken laws" at times. It was likely stressed to him by the examiner that persons who molest kids are likely to have broken other laws as well - thus conditioning him to respond to that question.
 
Since he "passed" and you ask this question I suspect he is telling the truth about not molesting and hence the polygraph may well have performed accurately in this case. This also suggests that while many may have knowledge of how polygraphs work, they have not internalized the information and may not be able to apply it under stress.

Interesting.

-Marty