fMRI Used For Lie Detection by the Government?

From Raw Story:

“Two private companies have announced that they will begin to offer “lie detection” services using Functional Magnetic Resonance Imaging (fMRI), as early as this summer. fMRI can produce live, real-time images of people’s brains as they answer questions, view images, listen to sounds, and respond to other stimuli.”

That’s just a little bit intimidating, I think. I’m sure most of you could use your imagination and think of the implications.