They're considered a valid tool for coercion.
Stupid criminals who watch too much TV think they work and some cop comes in and says he failed a lie detector test and they confess.
In that way they actually do work.
Assuming all you want is a confession but if the person actually provides evidence of their own guilt they so be it.
They're considered a valid tool for coercion.
Stupid criminals who watch too much TV think they work and some cop comes in and says he failed a lie detector test and they confess.
In that way they actually do work.
Assuming all you want is a confession but if the person actually provides evidence of their own guilt they so be it.