[LChoy]

Originally Posted by foofighter15

thats something that has always made me worry.
But don't that have lie detector tests for that kinda stuff?
I've never understood why when someone is being charged with a crime, why the lie detector test isn't at least part of the hearing sequence 100% of the time

The lie detector/polygraph isn't completely fool proof either. Because it is really sensitive to uncontrolled physiological responses, it tends to give a lot false positives. Also, it's not like a green light goes on for truth and red for lies. Instead, it's a visual graph of electrical stimuli that is compared to the base responses. Therefore, there is a little bit of subjectivity to it. Right now, photographic evidence and DNA (combination of normal and mitochondrial DNA) are among the gold standard of evidence.