In movies it is shown that through polygraph test it can be found whether a person is lying or not. But we all know that it is not correct. What I am asking can the polygraph test be modified, more data collected so that it becomes more accurate ? Also is there any alternative to polygraph machine to find whether a person is lying ?
It’s also been shown that the person asking the questions can easily manipulate the answers. If they ask nicely, calmly and reassuringly, the test will pass, if they ask in a “bad cop” way, the test will fail.
And since the control questions are usually not asked very inquisitivly, they don’t help for that kind of stuff.