Looks like it's real
http://www.nypost.com/p/entertainment/tv/hidden_money_3xD57tKw0Zta8etPjL2JzH
I was just looking to see if this was real or fake and I found that the New York Post interviewed the woman interrogator from the show.
“Going after people who aren’t mentally or emotionally prepared to be interrogated was the hardest part of this,” says Hanlon Stone. “That was profoundly difficult for me. The only thing that buoyed me was remembering that this was a game and the contestants knew the rules and had signed up for this.”
And it says that the contestants have to answer the questions but can lie if they want. It's pretty cool that it's real, it makes me like this show even more.