posted on Jun, 11 2013 @ 03:01 AM
You can sort of do the thing with an fMRI machine, by detecting which brain areas light up when you are put a question.
But a polygraph is a sort of blunt knife. A good operator can get a lot out of you with one, as long as you aren't taking something to screw up his
readings. Or if you're trained to be able to lie on one, which you can do with a bit of practice. Or you can do the old thumbtack routine.
As far as truth serum goes, it's not like Harry Potter. Again though, if you've got a good interrogation team, you can use the cocktail on the
person you're interrogating and get a lot of useful info. It takes a skilled hand and time to really work it right, though, or you'll get raw data
that may be bogus.