Quote:
Originally Posted by WaterAndWindSpirit
As far as I know, the only reliable way to tell lies from truth is to deconstruct the lies by looking for (and finding) contradictions. If someone tells two pieces of contradictory informations, at least one of them must be false (studies have found that people were less likely to lie in e-mails because they could be kept forever as evidence). If someone tells you something that contradicts evidence you have at hand, that person is most likely lying, or at the very least misinformed. So I think Detect Lies is or should be a cinematic skill. Hell, even D&D uses the approach that the Psychology skills only tell you the emotions of the person in front of you (is he/she tense, relaxed, scared...), but then a few prestige class get the explicitly supernatural ability to detect lies...
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There is no reliable way to detect lies.
In the realm of unreliable but real ways to detect lies there are a bunch of content independent tricks that push up the success rate somewhat if often less than their practitioners believe.