I had my poly today and found it a rather simple procedure, however it differed from the book somewhat. The pre test interview question period was rather long. How ever the actual test was only about 10 minutes long, he asked me 15 questions, and then we sat there for the "cool down" time and then did the questions all over again for a second time. He then unhooked the machine and said he didnt see any problems and would let my BGI know. I didnt employ any counter measures per se, however I can tell you I did not admit to ANYTHING.
Can I trust that he said I passed?
Based on your account, and in particular the absence of any "post-test" interrogation, it seems likely that you passed.