Reddit reviews The Everything Sign Language Book: American Sign Language Made Easy... All new photos!
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http://www.amazon.com/The-Everything-Sign-Language-Book/dp/1598698834
hah
But seriously
All these books are extremely wague and will give you barely anything that a reasonable person simply knows already.
I cannot reccomend any single one, but you should rather do a Search on cross-examination handbooks. They contain a lot of info how to spot person's lies or simply them being uncomfortable with your questions.
As for the observations form a distance the only thing really giving you some edge is personal life experience. The more people you meet, the better you may judge a complete stranger.