Speaking of skewing, How to beat a polygraph test
http://www.usnews.com/news/blogs/washington-whispers/2012/09/25/nsa-whistleblower-reveals-how-to-beat-a-polygraph-test
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First, Tice says, a person can trick the tester on "probable-lie" questions. During a polygraph's pre-test interview, the tester usually asks a person to answer questions they are likely to lie about. These include questions like: 'Have you ever stolen money?,' 'Have you ever lied to your parents?,' or 'Have you ever cheated on a test?'. Most people have done these at least once, but lie about it. So the tester uses a person's response to a likely lie as a way to establish how a person physically reacts while lying.
Tice says to trick the tester, a person should lie in response to these questions like most other people would, but also bite their tongue hard while doing so, which will set off other physiological reactions in the body. The tester's "needles will fly everywhere," says Tice, "and he will think, 'This guy is a nervous nelly. He has a strong physical reaction when he's lying.'"
"And you're skewing the test," he says.
Tice says it's also easy to beat a polygraph while telling a real lie by daydreaming to calm the nerves.
"Think of a warm summer night... or drinking a beer, whatever calms you. You're throwing them off," he says. "The needle might nip a little [because you're lying], but not off the charts." And since the person has already convinced the tester that they have off-the-charts physiological reactions while lying, Tice says, a small reaction likely won't tip the tester off.
The tests have also simply gotten easier, with the questions being less likely to shock an individual. "They use to say things like 'I bet you have sex with dogs,' just to initiate a reaction to see how that needle jumps if you've been insulted," Tice says. "[But they] have mellowed down a lot... Polygraphs are easy to beat."
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