How polygraph machines work

Close up of a finger sensor on a male undergoing a polygraph examination

Back in the day polygraph machines resembled those devices we often see in movies: wires of which the one end was connected to the examinee (the person taking the test) and the other to a box. This box had a single sheet of scrolling paper, on which various needles were scribbling what seems to the […]

Who’s suitable for polygraph testing?

According to the APA Polygraph Model Policy on Standards, there are some people who aren’t suitable for polygraph testing.They include minors, IQ-impaired individuals, and others. The list below should be regarded as advisory, with exceptions likely in extreme circumstances: 1. Age score Generally individuals of 12 years or older may be asked to undergo a […]