I saw the Mythbusters try to beet a polygraph. They had no luck. I wonder if they came accross this site when researcing techniques to try....

Beating a trained polygraph operator is more difficult than all of this (though I admit I didn't read through all of this - it's 1AM and I'm waiting for a scan to finish)

I did a background check for a pen-test recently that required an interview with a 20-year veteran CIA polygrapher.

I, being the curious sort, asked my interviewer once we were done whether the lack of the machine had any impact. 

The answer?

"When you've been doing this for as long as I have, you don't need a machine."

It's one thing to beat a biofeedback machine, but a machine with a trained operator is going to be much more difficult...