Stress levels can be compensated for because, let's be honest, if you're getting a polygraph then odds are you're a little nervous to begin with, even if you are telling the truth. Now there are cases where a subject is so nervous that they're results are inconclusive. What's supposed to happen is the test is regiven a couple times so the operator can get a sense on the subjects responses. The reality of this is, the test is rarely given more than once.
The biggest thing with a polygraph is whether the subject actually shows up for the test or if they repeatedly miss the test or reschedule, then that becomes a red flag for the police. Not proof of anything mind you, but it does indicate they might have some reservations that need further investigation.
I pretty much agree with your assessment.
And if only ONE BigFoot witness was taking the polygraph test the negatorists in here would have a solid argument.
However, when you test thousands of people saying the same thing and the vast majority of test results come up "+", you have to give way to science.
It's funny, you mention "polygraph test" in here and several people will scramble to say why it could never work on BF witnesses.
Are you all scared?
If the polygraph test is good enough to be evidence in a court of law, then perhaps the negatorists should be a little more respectful of its capabilites.
"I ain't afraid of no results" LOL