SanchoPanza wrote on Jan 4
th, 2008 at 5:45pm:
Until your latest post I had yet to read anything from you or about you other than you said you are a police officer, I think in Connecticut and your position on Polygraph which I believe is somewhat skewed by a bad experience. 10 years puts you well past the "I'm gonna be a cop until I can find a job" group. Law Enforcement is a respectable profession and I think that anyone who is willing to strap on a gun and a badge and place themselves physically between Society and those that seek to do it harm is worthy of respect. Would you agree?
You are rigid and unreasonable in your contention that polygraph is worthless because it has an error rate. Have you ever had or seen a misfire on the range? Was the misfire caused by the error rate of the ammunition manufacturer? Was it caused by the error rate of the firearm manufacturer? Was it caused by the error rate of the operator who failed to perform some necessary function to reduce the error rate? Are you following your standard of it’s worthless unless it’s 100%? Have you stopped carrying a sidearm? Have you ever junked a car because the battery’s error rate reared it’s ugly head or routinely toss all 4 tires because 1 had a flat? Do you have children? Do you disown them if they get a C on their report card? After all a C approximates 70% accuracy or conversely a 30% error rate. Are you aware of anyone who ever took a TB screen that indicated positive and had to go take a more specific test only to find out the did not have TB? Should we ban TB screening?
Do some of these analogies seem silly to you? No more silly than your contention that polygraph has to be 100% or worthless. Any research scientist would laugh at that position or at least shake his head and chuckle to himself.
If you want to argue that polygraph accuracy rates need to improve, I’ll agree with you. There is always room for improvement. If you want to take an opposing position as to whether polygraph should be used, we can do that. But if you want to be respected, you need to reconsider your 100% or worthless position. It doesn’t pass the silly test.
You may not have bothered to read any of my prior posts and known that I am a police officer, but you certainly have not responded to my posts with the same civility and lack of condescending sarcasm you found in those posts.
I have never said that since polygraph testing is worthless because it is not 100% accurate. I have said that the polygraph is worthless because it does not detect deception – there’s a difference.
If you handed me 100 rounds of brand “X” ammunition and I fired it all, and 75 of those rounds failed to fire because of a bad primer, I would certainly doubt the quality of brand “X” ammunition. I failed three out of four polygraphs while telling the truth; how rigid and unreasonable is it of me to believe that telling the truth has little or nothing to do with passing a polygraph?
Claiming that my position on the polygraph is based on the mere existence of an error rate is an example of a straw man argument, a common logical fallacy. By making my position out to be an illogical extreme it is far easier to refute. The fallacy lies in the fact that the original position has not been refuted – only the straw man of your own construction has been torn down.
My actual position is that, in my experience, I told the truth on four polygraphs, did not withhold any information, and failed the first three. I also failed for three different reasons, which is even more disturbing. If I had some sort of reaction to questions about drugs, it would be logical for me to show a reaction to drug-related questions on all four tests. But after failing my first test for drug-related questions, I never again showed a reaction to any questions about drugs, even though it would stand to reason that, having failed a polygraph for supposedly lying about drug use, I would be even more likely to show a reaction in subsequent polygraphs.
It would also make sense that if I had some sort of reason for reacting to questions about fighting, or about stealing, that I would have those reactions in all of my tests. But that didn’t happen, either. As far as I can tell, the polygraph examiner in each of my first three tests picked a random subject, questioned me about it, and then took a wild guess as to whether I was being truthful or not.
If the polygraph worked I would have passed all four of my tests. There is absolutely no reason for me to believe that for most other people in most other situations the polygraph has a high degree of accuracy, even though neither the instrument nor the examiner could tell the difference between truth and deception on any of my first three polygraphs. I don’t even believe the polygraph examiner could tell the difference in my fourth polygraph, even though I told the truth on that one as well. I figured it was just my turn for the coin toss to land on “pass” that time.
Regarding my experience, I don’t see how anyone could legitimately expect a high degree of accuracy from the polygraph. Even if you believe I was lying, then you would have to believe that I managed to successfully lie about fighting and stealing on my first polygraph, I managed to lie successfully lie about using/selling cocaine and stealing on my second polygraph, I managed to successfully lie about using/selling cocaine and fighting on my third polygraph, and I managed to successfully lie about everything on my fourth polygraph. Alternately, if you believe I was telling the truth, then I failed three out of four polygraphs for no reason whatsoever. Either way, the polygraph is a miserable failure and is clearly unable to detect truth or deception. Not because it is unable to claim 100% accuracy, but because it is unable to credibly claim any sort of reliable accuracy whatsoever.