Do you believe polygraph test can really detect the truth.?
I have a hard time believing that the polygraph is accurate when it was not created to detect the truth. So people just don't know the answer how can this sysem know the truth in that. Somebody please give me so clarity...
Answer:
The big problem with polygraphs, as I see it, is that questions directed to the conscious mind also trigger reactions in the sub-conscous mind.
The experience described by the second answer up from mine (by "gypsey") is a classic illustration of what that can do.
The fact is, no matter HOW honest a person is, none of us is perfect. Even if someone DID seem perfect to others, they could have secret, inner doubts about themself and their own level of "goodness". Even the person who has never broken a rule in his/her life can find SOMETHING to feel guilty about.
If I say to you, "DON'T think about a purple hippopotamus", what mental picture immediately comes to your mind? RIGHT! - A PURPLE HIPPOPOTAMUS!
Ergo, when you are tense and trying your hardest to avoid any kind of guilty thoughts, what comes to mind? EVERY guilty thought you have EVER had about ANYTHING!
The questioner could ask you if you killed Jimmy Hoffa, and if you are thinking about the time you wrecked your cousin's tricycle when you were 6 years old, and feeling guilt over it, - WHAT will show up on the graph - will your guilt feelings manifest themselves?
When the questions require straight "YES" or "NO" answers, you cannot qualify or further explain your responses. The questioner might mean outright robberey or embezzlement when he asks if you have ever taken money from an employer, but if you are thinking about and feeling guilty over the time you borrowed a $20 from a former employer six years ago and never paid him back, your "NO" answer could spike a negative response and create a totally untrue impression of you.
The technology cannot compensate for the conscious/sub-conscious link, and I doubt that many operators know how to work around it in their questioning - if there even IS a way to do so.
they are extremely unreliable, little better than flipping a coin.
It is not admissible in court, because it is not reliable.
Yes I quess I do!
Polygraph tests can be passed by a very calm sociopath.
I've seen polygraph witch hunts regarding a case about a mother whose child was kidnapped but the ex husband passed the polygraph and she refused to take it so the media were smearing her name over it which she ended up committing suicide. She was obviously the most stressed out over her child missing and polygraph tests aren't accurate for highly stressed out people.
They should be done away with as a pre-emptive strike against someone's guilt or innocence before trial.
Polygraph tests only detect the physiological signs typically associated with lying, increased heart-rate, perspiration, etc. They can't tell with 100% accuracy whether someone is lying or being truthful. They're more accurate in determining when someone is telling a lie, since most people will have those signs, few people know how to fool those tests. However, they're accuracy decreases greatly when someone is telling the truth. A person can display the same signs of lying when they are nervous or angry, which many people taking the test may be. It can read as a false positive.
they are 98% accurate... Fact.
a polygraph test is NOT admissible in a US court of law as evidence and cannot be used against you.
I think that they are a good starting point but need to be open to interpretation and considered along with other evidence. The monitor doesn't know why a question or word has triggered a reaction. It doesn't always mean that the person is lying.
Embarassing and silly example but Johnny Torrets was asked on the Culture Show if he thought Peaches Geldof was a good DJ while on a lie detector. He answered yes but the detector registered high stress levels, probably because he was rumoured to be seeing her and was worried where the next question was leading.
The polygraph "Can" tell the truth, but the individual taking the test can't be completely calm when taking it. There are too many variables that can change someone's answer to look like it's a lie, and vice versa. The fact that they aren't admissable in court shows how they can't be trusted.
no, I don't consider them too accurate
it's brainwaves.tension.if you're a calm killer you'd show up better than a nervous innocent.
A polygraph cannot detect the truth. It monitors how you react to the questions. If you sweat and your heart races then you are lying, so it thinks.
I say there were many innocent men found guilty because they were nervous about being on a Polygraph. If you have never been hooked to one and do not know anything about them, it could probably be quite daunting.
Hope this helped.
It is possible to cheat a polygraph test so i can see where you having a hard time understanding this but i believe it's OK since every one gets nervous when they telling a lie and think they are going to get caught. The test is able to detect that
Please understand this test is only "indicative" of the probability and not "conclusive" as evidence to a crime or criminal.
Police uses it to get in-depth information and then co-relate it with other direct and/or indirect evidences/information.
A much more sophisticated test is the "Brain Mapping" but again it is indicative and not conclusive about a crime or criminal.
I do not know why you are interested in this test, but what ever be your reasons, above is the background of this test and you can draw your own conclusions.
I actually know that they are not 100% correct. When I was 19 I took a job as a cocktail waitress. I knew that I would have to take polygraph test as a part of staying on long term. The 2nd day of working there, I was called into take the test. I had not even been allowed yet to use the system as of yet and was still following another waitress and had no money exchanged through me at all. My test showed that I had been stealing money from the nightclub. I questioned the person giving me the test on how this could even show up as reality because I had only been there for 1 actual evening? He said he wasn't sure and gave another test which I failed also. He then stated to me that because of nervousness these things are not always accurate for all people. Because my employer knew, I had only been there for 1 night, they let me stay for long term and there was no possible way that I had taken anything. I have always been leary of polygraphs since. It was creepy.
Not reliable. I believe these tests rely a lot on conductive skin response, which changes when you are nervous. A change in readings could indicate lying, or simply being made nervous by a question, or that you have hidden a tac in your foot and are pressing your toe against it, which creates the same response. Polygraph administration is not a science, it is an "art", meaning there are no set standards for when someone is said to be lying or not, and it is very interpretive. Polygraphers look for differences between physiological response to control questions, such as "what is your name", and assume that if a response to a tougher question produces a different response than the control question, which you answered truthfully, did, then you are lying. You can make it seem you are telling the truth by using the tac trick I mentioned above, creating a stress response every time you answer a question, so the examiner sees the stress response as your normal baseline and thinks you are telling the truth all the time. Polygraph tests are more reliable than merely flipping a coin, but an educated guess as to whether someone is telling the truth or not is not good enough for court, and they can be duped.
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Answer:
The big problem with polygraphs, as I see it, is that questions directed to the conscious mind also trigger reactions in the sub-conscous mind.
The experience described by the second answer up from mine (by "gypsey") is a classic illustration of what that can do.
The fact is, no matter HOW honest a person is, none of us is perfect. Even if someone DID seem perfect to others, they could have secret, inner doubts about themself and their own level of "goodness". Even the person who has never broken a rule in his/her life can find SOMETHING to feel guilty about.
If I say to you, "DON'T think about a purple hippopotamus", what mental picture immediately comes to your mind? RIGHT! - A PURPLE HIPPOPOTAMUS!
Ergo, when you are tense and trying your hardest to avoid any kind of guilty thoughts, what comes to mind? EVERY guilty thought you have EVER had about ANYTHING!
The questioner could ask you if you killed Jimmy Hoffa, and if you are thinking about the time you wrecked your cousin's tricycle when you were 6 years old, and feeling guilt over it, - WHAT will show up on the graph - will your guilt feelings manifest themselves?
When the questions require straight "YES" or "NO" answers, you cannot qualify or further explain your responses. The questioner might mean outright robberey or embezzlement when he asks if you have ever taken money from an employer, but if you are thinking about and feeling guilty over the time you borrowed a $20 from a former employer six years ago and never paid him back, your "NO" answer could spike a negative response and create a totally untrue impression of you.
The technology cannot compensate for the conscious/sub-conscious link, and I doubt that many operators know how to work around it in their questioning - if there even IS a way to do so.
they are extremely unreliable, little better than flipping a coin.
It is not admissible in court, because it is not reliable.
Yes I quess I do!
Polygraph tests can be passed by a very calm sociopath.
I've seen polygraph witch hunts regarding a case about a mother whose child was kidnapped but the ex husband passed the polygraph and she refused to take it so the media were smearing her name over it which she ended up committing suicide. She was obviously the most stressed out over her child missing and polygraph tests aren't accurate for highly stressed out people.
They should be done away with as a pre-emptive strike against someone's guilt or innocence before trial.
Polygraph tests only detect the physiological signs typically associated with lying, increased heart-rate, perspiration, etc. They can't tell with 100% accuracy whether someone is lying or being truthful. They're more accurate in determining when someone is telling a lie, since most people will have those signs, few people know how to fool those tests. However, they're accuracy decreases greatly when someone is telling the truth. A person can display the same signs of lying when they are nervous or angry, which many people taking the test may be. It can read as a false positive.
they are 98% accurate... Fact.
a polygraph test is NOT admissible in a US court of law as evidence and cannot be used against you.
I think that they are a good starting point but need to be open to interpretation and considered along with other evidence. The monitor doesn't know why a question or word has triggered a reaction. It doesn't always mean that the person is lying.
Embarassing and silly example but Johnny Torrets was asked on the Culture Show if he thought Peaches Geldof was a good DJ while on a lie detector. He answered yes but the detector registered high stress levels, probably because he was rumoured to be seeing her and was worried where the next question was leading.
The polygraph "Can" tell the truth, but the individual taking the test can't be completely calm when taking it. There are too many variables that can change someone's answer to look like it's a lie, and vice versa. The fact that they aren't admissable in court shows how they can't be trusted.
no, I don't consider them too accurate
it's brainwaves.tension.if you're a calm killer you'd show up better than a nervous innocent.
A polygraph cannot detect the truth. It monitors how you react to the questions. If you sweat and your heart races then you are lying, so it thinks.
I say there were many innocent men found guilty because they were nervous about being on a Polygraph. If you have never been hooked to one and do not know anything about them, it could probably be quite daunting.
Hope this helped.
It is possible to cheat a polygraph test so i can see where you having a hard time understanding this but i believe it's OK since every one gets nervous when they telling a lie and think they are going to get caught. The test is able to detect that
Please understand this test is only "indicative" of the probability and not "conclusive" as evidence to a crime or criminal.
Police uses it to get in-depth information and then co-relate it with other direct and/or indirect evidences/information.
A much more sophisticated test is the "Brain Mapping" but again it is indicative and not conclusive about a crime or criminal.
I do not know why you are interested in this test, but what ever be your reasons, above is the background of this test and you can draw your own conclusions.
I actually know that they are not 100% correct. When I was 19 I took a job as a cocktail waitress. I knew that I would have to take polygraph test as a part of staying on long term. The 2nd day of working there, I was called into take the test. I had not even been allowed yet to use the system as of yet and was still following another waitress and had no money exchanged through me at all. My test showed that I had been stealing money from the nightclub. I questioned the person giving me the test on how this could even show up as reality because I had only been there for 1 actual evening? He said he wasn't sure and gave another test which I failed also. He then stated to me that because of nervousness these things are not always accurate for all people. Because my employer knew, I had only been there for 1 night, they let me stay for long term and there was no possible way that I had taken anything. I have always been leary of polygraphs since. It was creepy.
Not reliable. I believe these tests rely a lot on conductive skin response, which changes when you are nervous. A change in readings could indicate lying, or simply being made nervous by a question, or that you have hidden a tac in your foot and are pressing your toe against it, which creates the same response. Polygraph administration is not a science, it is an "art", meaning there are no set standards for when someone is said to be lying or not, and it is very interpretive. Polygraphers look for differences between physiological response to control questions, such as "what is your name", and assume that if a response to a tougher question produces a different response than the control question, which you answered truthfully, did, then you are lying. You can make it seem you are telling the truth by using the tac trick I mentioned above, creating a stress response every time you answer a question, so the examiner sees the stress response as your normal baseline and thinks you are telling the truth all the time. Polygraph tests are more reliable than merely flipping a coin, but an educated guess as to whether someone is telling the truth or not is not good enough for court, and they can be duped.
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