We had a famous case here in Georgia where a couple of enterprising sheriff's deputies hooked up a colander to some batteries and a light. Then when the suspect said something, they would mash a button and the light would flash, and they'd yell, "You're Lying!" He confessed.
Conviction was reversed -
Yes they use the idea that there is a magical machine that can detect lying in the hopes you will confess. Nothing so far can do that. Maybe the Neural Link Musk is working on.
There has been research on lie detection using functional MRI. (fMRI). As of now this technique isn’t fully developed as well as being too expensive, intimidating, and invasive for widespread use. Personally, I’d like to see this research hit a dead end, because I’d like there to be some shred of personal privacy, but that’s a discussion for another time.
When I was 22, I had to take a lie detector test to get a job at an investment bank.
I also had to wear a suit, 3 piece preferred, actually groom and be on time :)
It was 1990...a loooooong time ago.