::Back in highschool I made a lie detector as a science project, the teacher thought I was sick, she gave me a C for it.... out of a couple of coils tied to some metal handles with a 12V transformer, people were courious on how it would work. The trick was to have the person grab the handles, I ask a (?) and if I didn't like the answer, flick the switch...then I got what I needed to hear.