Let's say that a method of lie detection was created that was 99.99% accurate, portable, and cheap. It is also very generally applicable, and there is no known method to fool it.

Now, it is ubiquitous in society. Employers regularly use lie detectors to confirm that employees have not stolen or otherwise defrauded the company. Schools use lie detectors to confirm that students are not cheating. Even parents might utilize a lie detector to make sure their children (usually teenagers, since it is easy to tell when young children are lying) are not lying. There are of course many other uses.

Of course, most people find this very convenient. Employees need much less supervision. Students can take tests at home. Parents do not have to worry about their children doing bad things.

But a very small group of people do not like the lie detector tests. Some find them invasive. Some are opposed on obscure religious grounds. And, unfortunately, some people just want to lie without getting caught.

We will focus on people who are not trying to lie, but do not want to be lie detected for some other reason. How can they avoid being lie detected? (EDIT: Clarification. When I say "lie detected", I mean that the lie detector is used on them. It does not matter if it actually detects a lie or not.)

Some notes:

1. Technically, it is never legally required to take a lie detector test. That being said, people can deny you employment, schools can expel you, and people can choose to assume you're a liar if you don't. Additionally, in a court of law, no testimony is accepted without a lie detector test, so if you are accused of a crime, you would not be able to testify in your own defense. More troubling, if someone commits a crime against you, you can not testify against them. Indeed, police will not even start an investigation without the person reporting the crime taking a lie detector test (unless they have extremely convincing evidence).


2. This probably is not important, but I will explain what the lie detector actually detects. Technically, it is not a "lie" detector, but a "deception/misleader" detector. It detects whether or not someone is trying to deceive or mislead someone. So for example, if you shoot someone and said "I did not kill that person", which is technically true since the bullet killed them, it would still register on the lie detector. Likewise, if you said "I witnessed the shooting at noon", when in fact you witnessed it as 11:58 a.m., it would not register on the lie detector, since you were not attempting to mislead, even though the statement is technically false. Essentially, whether a lie gets detected depends on intent, not the statement itself.


3. In accordance with the Rule of Funny, if you state something with the intent of being paradoxical, such as saying "this statement is false", the lie detector will short circuit and fume with smoke, rendering it useless. It should be noted that this is not a great way to make friends.


4. It is not possible to use a lie detector on someone without them knowing, and using a lie detector on someone without their consent would be assault, even if you are a criminal. There is currently a case in the Supreme Court about whether you can even lie detect terrorists.

How do the Amish avoid using electricity?

Schools use lie detectors. So do the police and employers. The obvious solution is to not use schools, police, or employers. Only work for each other, never report crimes to the police, and teach your kids at home.

The ability of an insular farming community to implement this method is obvious. But, believe it or not, this works in cities too. The above statement applies almost completely to various Orthodox Jewish communities that can be found in Brooklyn, and assorted other cities in the US. How do the Orthodox avoid driving on the Sabbath? They make sure they live within walking distance of the synagogue.

Furthermore, it is possible to form your own community, with your own community rules, if you want to have a functioning police force that does not use the lie-detector.

Finally, it is important to note that both the examples seen here are in-fact people that object to certain things on 'obscure religious grounds.'

Invent a medical condition and bribe a few doctors/professors.

The easiest way I can think of to avoid this is to provide a reasonable explanation to anyone who might use the lie detector why it can’t function on you. Then whenever anyone asks you to take a test you can roll out the testimonials of doctors and previous test results showing conclusively that you have ‘LieDetectorsDontWorkOnMe Syndrome’.

All it would take is a few talented liars/ properly medicated people that can ‘break’ the test (ie give spurious results on baseline questions) and a couple of papers submitted to appropriate journals/media outlets showing that a rare few people can’t be accurately judged by the lie detector. Let the story become increasingly well known. Bribe a doctor to give you a diagnosis (or forge some appropriate looking documents). Then, whenever anyone asks you to take a test, simply say there’s no point and show them your documentation. You might have a hard time if someone becomes suspicious of you, but that’s sort of the nature of this game.

I misunderstood the question being asked in my previous answer, so here is another try...

Lie Detectors should have trigger phrases which activate their detection functionality in the same way as "Alexa" and "Hey Google" work in modern voice controlled systems.

For a statement to be submitted for lie detection, it must be preceded by the phrase "I solemnly swear that...". The lie detector will then verify the validity of all statements by that speaker until a second trigger statement such as "End Lie Detection" is announced or until ten seconds of silence occurs.

Ownership of a lie detector which does not require such verbal control would be a felony.

In this way, an abstainer from this technology simply needs to refrain from pronouncing the triggering phrases.

What about people with mental problems?

You have poor long term memory.
Say you DID eat those cookies.

Yet next week your mom will ask if you ate those.

You honestly don't know, hence the lie detector won't blip due to no intent.

Now, say you consume pills that hinder your memory. Pills -> eat cookies -> "I don't remember touching the cookie jar."

What you need to do is create and teach yourself a personal language, one which sounds a lot like English but has a few significant differences. The word "Yes" is pronounced "No" and "No" is pronounced "Yes". "Didn't" is pronounced "Did" and so on.
When someone asks you a question in the presence of the lie detector, you must strive to be as truthful and complete in your answer as possible, but choose the language with which you speak your truth with consideration for your personal agenda. Also, no matter how many people happen to be in the room with you and the lie detector, always talk to yourself since you are completely fluent in both English and your personal language and know which is being used in any given sentence. In this way, you are still technically being truthful, with no intent to mislead the person you are talking to; so the lie detector should be happy with everything you say.