What does a liar look like? And why you should care.

Ryan Braun, Bill Clinton, Richard Nixon, Anthony Weiner, Lance Armstrong, O.J. Simpson, Milli Vanilli, John Edwards, George Ryan, Rod Blagojevich, Pete Rose, David Petraeus ... liars all. And they all look just like us. "We don't have a drug problem here." We hear this all the time. How do you know? Really. Unless you've tested all [...]