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.)
- 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).
- 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.
- 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.
- 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.