Benedict Carey's article is part of the Science Times' special Forensics section. Read his article, "Judging Honesty By Words, Not Fidgets," and check out the rest of The New Forensics issue.
Also, if lying appeals to you, listen to Radio Lab's show on Deception.
Beating a polygraph test may not get you in the clear if you're lying. But just in case, watch this video for pointers.