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… [ Accelerating Intelligence News]

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