Attorney Michael P. Maslanka has an intriguing post on how to spot a lie. Here's an excerpt but be sure to read the entire post:
I am very interested in cognitive theory and so really enjoyed reading “Liespotting: Proven Techniques to Detect Deception" from Pamela Meyer. She tells us that a deceiver may do the following, often in close proximity: 1. Use a qualifying statement:" As far as I know" or "To tell you the truth." 2. Repeat back your question verbatim. 3. Dodge the question: "I already told that to HR." 4. Resort to religious references such as "I swear on the Bible." 5. Object to irrelevant to specifics: "No; I had the chicken, not the steak."