How portable are these lie detectors?

When I read something like this, I start to wonder just how portable a system like this can be made?

Brain imaging ready to detect terrorists, say neuroscientists. Brain-imaging techniques that reveal when a person is lying are now reliable enough to identify criminals, with 99% accuracy, claim University of Pennsylvania School of Medicine researchers.

When someone lies, their brain inhibits them from telli... [KurzweilAI.net Accelerating Intelligence News]

[tags: brain lying interrogation military crime]