Discovery channel aired a show tonight 3-25-04 called "More Than Human" where they conducted a mock test to see who could detect lies better... a 3 person panel of humans (astrologist, fbi agent, professional poker player) or a combination polygraph/voice stress/eye analyzer.

Each person on each team had to decide on which questions (25 in all) the person was lying on, here are the results:

Polygraph - was only correct on 16/25
Voice stress - was only correct on 21/25
Eye - I didn't write this one down, 16/25?

FBI agent on panel - 17/25
Professional poker player - 17/25
Astrologist - I didn't write this one down,something like 10/25

This just goes to show you that whether it's a polygraph, voice stress, eye analyzer, fbi agent, poker player, or astrologist... they can't detect whether you're lying and it's nothing more than 50/50.