Can you beat a lie detector test?

Commonly known as lie detector tests, polygraphs work by measuring physiological changes in the body, in this case respiration rate, pulse, blood pressure and galvanic skin response, which measures the electrical properties in the skin. Other methods can involve measuring pupillary changes and brain activity using an fMRI.
Polygraph evidence is generally not admissible in criminal court in the US and most of Europe. But the authorities have found other uses for them.
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