50 I note the detailed submissions on the part of the prisoner on this issue. I do not agree that Dr Pulman, the neuro psychologist, expressed the opinion that the head injury at four has a causal link to the offending behaviour the subject of the charges. If it purports to do that there is no analysis of the "causal connection", in a factual way, or how there was a direct causal relationship between injury and the crimes. I could not conclude in any event, on the balance of probabilities, that the prisoner committed the current offence because of an injury suffered as a child when he was four years of age. In fact, that proposition is completely unsupported by the totality of the evidence. The neuro psychologist's opinion is very general and lacks real particularity on this matter. The objective facts, the accused's explanations of his conduct leading up to the events of early April and other material, speak not of spontaneity, or impulsiveness, or lack of time for formulation of judgment, or confusion of thinking, at the relevant time. No such matter is revealed consistent with a "causal link". I am prepared to accept that the head injury may have contributed to subsequent behavioural characteristics and the like, including impulsive behaviours, that made the prisoner more susceptible to risk taking behaviour, including the use or abuse of prohibited drugs. I am well satisfied on the balance of probabilities that the prisoner by reason of his drug dependency and his indebtedness arising out of that drug dependency, was made susceptible to the offer of financial advantage to come to Australia to assist in the importation of cocaine. The prisoner was also vulnerable because of the loss of his employment contributing to his increasing indebtedness and his emotional vulnerability with the loss of his relationship, the loss of his licence and the like, of which he speaks. It may be that his general personality contributed to these difficulties as well. Unscrambling the component influences upon the development of his personality is now an impossible task.