What is crucial from a legal standpoint is the mental state of the offender at the time of thecriminal act. Neuro imagery techniques are always performed after the individual has committed the offence, so that they are not able to provide information on the mental state of the accusedat the crucial moment, that when the crime was actually committed. It is essential to remember that no one can reconstruct post hoc what took place in someone’s brain at the time of a crime[36]. As recalled by Catherine Vidal [32], “seeing anatomical variations in a brain does not meanthat they have been present since birth, nor that they will remain”. MRI gives an “instantaneous”image of the state of the brain of an individual at a given moment. It provides no information onthe motivations or thoughts of the offender at the time of the act. It has no diagnostic or predictivevalue for the emergence of deviant behaviours.