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I haven't read the book, but my 1st thought is that his list of caveats is probably just the tip of the iceburg AFA ways to throw the process off. Behavior is too easily affected by drugs, alcohol, personal problems in people's lives that they're thinking about but don't want to share, random acts of kindness that put them in an especially good mood -- never mind deliberate attempts to fool the viewer. Sounds too much like feel-good pop psychology IMO.
But then I could be totally off base -- I'm making a snap decision without studying the book in detail...
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