So you think he's a real fart smeller?
Yeah, lie detectors can be beat, especially by psychopaths that lie all the time - like politicians. Certain drugs help people to beat them too. Then there is the possibility of infiltration of the group that performs the tests /analyzes the results.
Everyone thinks there is always a magic pill. Do this one thing and it will fix everything. That change goes in another direction that then goes haywire. Multiple things always have to be hit to get the pinball into the slot.
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