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I think this is what makes traitors such a popular series - absolutely everyone things they can tell when someone is lying, but the truth is it's really difficult. Especially if someone is a stranger, it's next to impossible to separate what might be possible tells from what might just be their personality.

But that's what this article argues. People changing their story IS evidence.

All "reality" shows are scripted.

you only see what the production staff want you to see, things are staged and composited to keep you hooked.