Quite honestly the presence of a polygraph in any competition is more a deterrant for someone to not cheat than what the results could conclude anyhow and anyone who believes any different should do some reading. There is a reason that (speaking specifically for Texas) law forbids their use completely in all law enforcement contexts. Simply put, the results are unreliable. Don't think for a second that they can't be beaten...heck the elite military trains for it. Good poker players would have no problem.
When you enter a competition, you agree that should you win you will be subject to a polygraph test and by doing so you also agree to accept the results of that test. Taking it one step further and thinking that the same test results could be the basis for some type of lawsuit is absurd.
It's quite a shame in my opinion that something like this is even a topic of discussion. It's a hog hunting tournament for goodness sakes.
I agree 100%