How does a polygraph work?

The polygraph detects microscopic changes at four points of the human body as they answer a series of Yes or No questions.
Studies have proven that a certain level of body reaction indicates either truth or lies.

You can not become a police officer without passing a polygraph exam.

Why can I only choose four questions for during a polygraph test?

Any more than four questions of importance would no longer be focused. And decades of study have shown this to be the optimum number for accuracy.

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    Polygraph differences

Antique polygraph equipment, known as 'analog', was simply a roll of chart paper with four moving pens. Computerized polygraph equipment came out in the early 1990s and is amplified, far more sensitive, and much more accurate.