Investigators probing the alleged murder of Pune-based developer Ketan Agarwal at Lohagad Fort have sought a polygraph test (lie detector) for accused Siya Goyal, arguing that the examination could ...

Polygraph tests can supposedly detect when a person is lying. But how can a machine do that, and can we really trust the ...

Officials said a polygraph test can be conducted only with the voluntary consent of the accused and the permission of the court.

A polygraph test measures a person's physiological responses while they answer a series of questions. These include breathing rate, heart rate, blood pressure and skin conductivity.

The Las Vegas Metropolitan Police Department's use of polygraph tests in the hiring process is raising some questions. Channel 13's Darcy Spears takes a closer look.