system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: Why aren't lie detector tests used more in the justice system, and if it is because they are inaccurate, why haven't more accurate detectors been developed? 

I was thinking about the OJ Simpson case in particular, but it applies to a lot of cases. Wouldn't they at least be a big piece of evidence in cases? I'm not saying they will determine the outcome of the case alone, but they could be pretty useful information in my opinion.
gpt
Lie detectors aren't just inaccurate...they are voodoo.  There is no scientific basis for their operation, and what little testing that has been done indicates they are no better than trained observers.

Asking why we can't make a more accurate lie detector is like asking why we can't make a more accurate Ouija board.