There is much more that they take into consideration for the polygraph phase. I have successfully passed the polygraph phase for one of the major federal law enforcement agencies. They take into consideration everything: your attitude when being told you're a liar, the tone of your voice, your non verbal body expressions, eye contact, if you stay calm, etc.
     I was told I was lying several times, in fact after each session was graded. I remained calm and consistent with all my answers, regardless of the accussation. I looked directly into his eyes everytime I told him I am being truthful. 
     The first day lasted for 6 hours without a lunch break, then they wanted me to come back the next morning the re-test just the questions I was having problems with.
     The next morning the session lasted for about an hour, and all of a sudden all the questions that supposedly were not clearing the day before, were clearing, and they told me I passed.
     It's a game, they are testing your character, mental strength, respectfulness, and dedication. I've read most of the statements on this site, and they all made the common mistake of becoming defensive with the examiner. These people have to remember this is business between them and the examiner, not personal. They are acting like that for a reason, the same reason the drill instructor acts with his new recruits in boot camp. They have to be absolutely sure about who they hire.
     I'm in the last stage of the process (background investigation), and just had a home interview with an agent.

  Dear Passed:  I read and respect your post.   

I am in the final stages of the hiring process and getting ready to go in for a polygraph in a few days with a major federal law enforcement agency.

I think what you say in your post is right.  The tester IS looking at you as a whole person; the complete "package" is being scrutinized, and rightfully so.   

Are you respectful to the tester?  I would hope so, but from reading posts on this forum, I gather that is not always the case.  ARE you honest, etc. ?  Or are you in there playing mind games?  CAN you be trusted?  ARE you dedicated?  Do you have what it will take?  Thats what this basically boils down to, isn't it?  WILL you let them down when they need you or will you be there for them?  Do you have integrity?  Are you reliable?  Of good character? 

Are you deserving of this clearance and this position of public trust?   

A lot of people who make it this far, frankly, are not. 

And hopefully this does weed most of them out.

And sometimes I think some people lose sight of the basic reason this is being done: to vet you as a whole person, out, to see if you do "have the right stuff". 

I don't plan on using any CM in my test or trying to beat the guy.  I don't think I will need to at all.   

Thank you for having this site and forum.