Is the standard lie detector test (also known as the polygraph) reliable? Should you be concerned about taking a polygraph test? Let’s start with a true story.
The FBI gives agent applicants a lie detector test before hiring them. After 9/11, their polygraph failure rate went to 50%. Did liars suddenly start applying for jobs? No, but the testers were instructed to read the tests differently, even though this meant throwing out some honest people with the few dishonest ones. Imagine what this would do to your future. For all of their lives these mostly innocent people will have a record of a failed FBI polygraph following them.
Most scientists now agree that polygraph “testing” is junk science. In fact, John Larson, one of the pioneers of polygraphic lie detection, says “I’m sorry I ever had any part in it’s development.” The test is valued by governments and others because it is useful for getting damaging admissions from people, especially those who don’t know that the test is a sham.
Unfortunately, the lie detector test is actually biased against the truthful. This is because the more honestly one answers...
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