Under the direction of the celebrated Dr Reiland he has been conducting experiments to measure imperceptible physical changes that occur in the body under the stress of great emotion. These techniques are intended for use in diagnosing mental disorders but Trant has come to the conclusion that these same techniques could be used in criminal investigations. These tests can provide conclusive proof as to whether a subject is telling the truth, and can also provide incontrovertible evidence that a subject has a strong emotional response to other pieces of evidence for a crime. These tests can measure physical changes over which a subject has no control and they are accurate even in the case of subjects who have trained themselves to give away no visible evidence of such emotions.