I know I am inviting flames here but let me go out on a limb and say that the fact that Terri voluntarily sat through two polygraphs tells us much more than the fact that she supposedly "failed" one or more of them. Most investigators will say that the real value of polygraphs is that people actually believe they can detect lies and therefore will make statements or admissions while hooked up to the machine that they wouldn't make in and ordinary interview. And even though the polygraph itself is not admissible in court because it is generally deemed unreliable, any statements or admissions that a person makes during the polygraph session can be used by the prosecutors at trial.
Everyone know that a polygraph just measures the physiological indicators that can change in response to anxiety on the theory that deception will be accompanied by some level of anxiety. But often it can be the nature and/or the manner of questioning that produces the anxiety, not the answer. We know that the questions put to Terri were so upsetting to her that she went home and vented about them and even walked out, so I'd be shocked if those polygraphs DIDN'T show indications of anxiety. Yet she still showed up to go throuigh the process 3 times. So the question is: is it more likely that a guilty Terri stupidly thought that if she kept going back she'd eventually fool the machine or that an innocent Terri stupidly thought that if she kept going back the machine would clear her?
Everyone know that a polygraph just measures the physiological indicators that can change in response to anxiety on the theory that deception will be accompanied by some level of anxiety. But often it can be the nature and/or the manner of questioning that produces the anxiety, not the answer. We know that the questions put to Terri were so upsetting to her that she went home and vented about them and even walked out, so I'd be shocked if those polygraphs DIDN'T show indications of anxiety. Yet she still showed up to go throuigh the process 3 times. So the question is: is it more likely that a guilty Terri stupidly thought that if she kept going back she'd eventually fool the machine or that an innocent Terri stupidly thought that if she kept going back the machine would clear her?