Even at this device's estimated 90% accuracy it would still be problematic. Until we reach the accuracy levels of DNA testing, this should never be allowed in court. 1/10 being wrong is not that great.
Don't be surprised with where they take this technology. Eventually, I believe a case on its admissability as evidence will go before the U.S. Supreme Court.
Men hungrier for revenge than women, brain scan study reveals
Empathic neural responses are modulated by the perceived fairness of others The last link is the Nature article in a pdf format that's the basis for the article about men and revenge.