Polygraphs

Yes, it is possible.

Polygraph results have consistently been held by the courts to be inadmissible at trial. There are some jurisdictions that allow them under limited circumstances, but in most jurisdictions they are per se inadmissible. The science has not been proven to be reliable, even under the most lenient standards, and the danger of unfair prejudice (confusing and misleading the jury) greatly outweighs any probative value. Every so often a defense attorney will have a client that passes a polygraph, or a co-defendant or third party that fails a polygraph, and they want desperately for the jury to hear these polygraph results. I have had both situations and have used the polygraph results in pre-trial negotiations, but resist the urge to ever ask a court to admit the results in front of a jury. This is a two-edged sword, and the government's side of the blade cuts deeper than the Defendant's. If the courts begin to admit polygraph examinations for defendants, they will surely begin to admit them for the government as well, and you can bet it would happen loud and often. What are the problems with polygraph examinations? First of all they are not reliable. Contrary to popular belief, they do not tell the examiner whether the subject is telling the truth or lying. They can indicate deception based on physiological reactions to the questions posed, but even an indication of deception or lack of deception can be skewed by an individual's physiology or the bias of the examiner. Some people are inherently nervous, and others are unshakable. Some people can control their physical reactions. My biggest problem with polygraph examinations by the government is that they are often nothing more than an interrogation tool. While polygraph results are not admissible in court, statements made by the defendant during the course of the examination probably are admissible. A common tactic is to wire up the subject, begin questioning him or her, tell them that the machine proves that they are lying, and then continue interrogation of the subject until a confession is obtained. Often clients insist that they want to take a polygraph for the government, to prove their innocence. And I don't blame them - it may be that they know that they are innocent, and they are convinced, like most people, that polygraphs are infallible lie detector tests that will prove their innocence to the police or the prosecutors. They don't understand that 1) under the best of circumstances the machines are not 100% reliable, and 2) in the eyes of an FBI agent, SLED agent or investigator for the local sheriff's department, they are guilty and the polygraph is nothing more than a tool to obtain additional evidence. This is not to say that polygraphs are not useful, because they are. We use respected independent polygraph examiners in some cases, where a client insists on a polygraph, but rarely will we consent to allow a government polygraph/interrogation. If the results from the independent polygraph examination show no deception, we will allow the government's examiner to review the charts and discuss the interview with the independent examiner. If the results are not favorable (this does not necessarily mean that the person is guilty), the government does not need to know about it and they do not then have the opportunity to interrogate the client.

Yes, there are a few methods which have been used to cheat on polygraph tests. The most common method is the 'Tack in the Shoe', where the person being polygraphed places a tack in their shoe, and whenever asked a question, they could step their heel on the tack and then answer the question falsely, as the lie is masked by the pain of the tack inside the person's heel.

An instrument for multiplying copies of a writing; a manifold writer; a copying machine., In bibliography, a collection of different works, either by one or several authors., An instrument for detecting deceptive statements by a subject, by measuring several physiological states of the subject, such as pulse, heartbeat, and sweating. The instrument records these parameters on a strip of paper while the subject is asked questions designed to elicit emotional responses when the subject tries to deceive the interrogator. Also called lie detector

No. They can be fooled which is why they are not admissible as evidence in a court of law (at least in the US)

YES!! but it depends on the town your in if its really small no but they might make you go to the academy in the nearest town and then yes you will have to they ask the most messed up questions...

to see if people were lying

A lie detector is designed to detect the small changes in your body when you lie, as opposed to when you tell the truth. For most people, a deliberate lie will cause stress in the nervous system, and this may be seen as changes in pulse rate, breathing, or sweating. More complex instruments (such as an EEG) can detect the changes in the nerve impulses directly, but are harder to interpret.

To check if they are as dumb as the 1 asking this q.

A polygraph test is commonly called a 'lie detector'. The passage of time would not affect your chance of passing the test. The test measures skin response, heart rate, blood pressure, breathing, etc., to judge whether you are lying. If you know you are lying, then there is little difference between a day and a year. Your reaction will be the same.

This is very different from a blood, urine, hair, etc. test.

Laurel Coppock

One legit angle might be cases involving memory loss from automobile or other accidents which may have taken human life- so-called Vehicular homicides. they usually call in Pyschiatrists and there is always the possibility the person being tested may be faking amnesia ( memory blot outs or loss). Another possibility is the test subject may be in fear for their own life ( from accident) and will tell the police anything they want to hear- to get them off their back- nerves, or whatever. there are balancing acts between Police fact-finding and medical compassion. if the test subject is drunk- well you know Sarge, I was coming down the Boulevard and I saw this huge Pink Dinosaur and I put on the brakes, but... oh boy.

No. Not the sole results of the polygraph. However, they can be used by law enforcement as an investigative tool. The results that are produced by those interviews, if investigation substantiates them, ARE admissable.

You don't need to spend lots of money just to buy a lie detector machine. From the start all you have to do is what the doctor uses, blood pressure. If you use this and someone is lying or hiding things you will know the way blood pressure react. Try it and you'll see. Good luck

Lie detectors are now considered an outdated and ineffective way of determining guilt or innocence; they can be easily beaten or dodged by someone with a few minutes' training and some practise.

Most lie detectors are based on detecting the activation of the autonomous nervous system when lying. Such effect are increased sweating and elevated blood pressure.

A blood pressure meter could thus be used as a primitive lie detector. This method would however require information on changes in person's blood pressure while lying and would still be prone to confounding factors such as stress.

A court can order you to take one, yes.

yes it does, but i still don't know how to operate it appropiately. i just got this watch yesterday.

Hold your breath between questions. A polygraph measures and detects your heart rate meaning if you lie or nervous your heart rate will beat faster. Holding your breath will slow your heart rate.

Viagra is a medication primarily used to treat erectile dysfunction and does not have any direct effect on polygraph results. A polygraph measures physiological responses such as heart rate, blood pressure, and respiration, which can be influenced by anxiety or stress rather than the medication itself. While some may believe Viagra could alleviate anxiety related to sexual performance, it won't specifically help in passing a polygraph test. Ultimately, the best way to pass a polygraph is to answer truthfully.

AHH a lie detector ANSWER by Engl1sh: A perfessional typically uses the term 'polygraph' test.