"2 Persons suffering from diminished responsibility. (1) A person ('D') who kills or is a party to the killing of another is not to be convicted of murder if D was suffering from an abnormality of mental functioning which— (a) arose from a recognised medical condition (b) substantially impaired D's ability to do one or more of the things mentioned in subsection (1A), and (c) provides an explanation for D's acts and omissions in doing or being a party to the killing. (1A) Those things are— (a) to understand the nature of D's conduct; (b) to form a rational judgment; (c) to exercise self-control. (1B) For the purposes of subsection (1)(c), an abnormality of mental functioning provides an explanation for D's conduct if it causes, or is a significant contributory factor in causing, D to carry out that conduct. (2) On a charge of murder, it shall be for the defence to prove that the person charged is by virtue of this section not liable to be convicted of murder. (3) A person who but for this section would be liable, whether as principal or as accessory, to be convicted of murder shall be liable instead to be convicted of manslaughter. (4) The fact that one party to a killing is by virtue of this section not liable to be convicted of murder shall not affect the question whether the killing amounted to murder in the case of any other party to it."
"It appears to us to be wide enough to cover the mind's activities in all its aspects, not only the perception of physical acts and matters, and the ability to form a rational judgment as to whether an act is right or wrong, but also the ability to exercise will power to control physical acts in accordance with that rational judgment."
"I went back and I sat and I waited. When I thought Matthew was asleep I went up to her room."
"... As to his sexualised behaviour, Dr Rooprai said that Jason's attitude to sexual relationships had been blurred by experiences, and he has deficits in understanding appropriate social norms. Dr Rooprai did not believe that the defendant could form a rational judgement in relation to the question of having a relationship. He said, 'In my view he was aware of the nature of his actions. However his deficits affected his ability to form a rational judgement and to exercise self-control. To form a rational judgement about an action, the person should be able to appraise the social, emotional and intellectual dimensions of an action. 'However, due to his ASD and mild learning disability, Jason suffers with deficits in all of these domains, which in turn would affect his ability to form a rational judgement. Additionally his lack of theory of mind, a very egocentric view of the world, ADHD and mild learning disability would all contribute to the impairment of his ability to exercise self-control.' ... He said that Jason's desire was to have sex and he was unable to form a rational judgement as to how to go about that, in the right way. He could not understand what the normal way was to approach the question of having sex. He said that his actions might appear to have been planned and thought through, but they are not, because what Jason was seeking was the end result, namely sex, and so he was simply intent on achieving an end goal, which appeared rational to him."
"He wanted just one thing to happen and he understood the means to that end. He knew that he was not allowed to strangle her and that it would be wrong to do it."
"Did he follow a rational decision taking process that led to an illogical or wrong outcome or was his decision taking irrational? What is the expert's view on this? The Defendant appears to admit he knew it was wrong when at the scene. Did he comprehend, in the expert's view, that this was wrong when 'toing and froing' outside her room? He appears to know right from wrong, for example, knowing he shouldn't enter her room. Why can he apprehend right from wrong on some things and not other things?"
"In the defendant's mind he was taking a rational decision-making process which led to a wrong outcome."
"Dr Amos said that Jason was clear that he went to Melissa's room to have sex with her. He had been thinking about it and was sexually attracted to her. He did not have a clear plan as to how he was going to achieve that end. When he got there he decided the best way was to strangle her to unconsciousness so that he could drag her to his room. He said if he could get her back to his room, he had no clear plan beyond having sex with her. Dr Amos was asked why he had reached the conclusion that the defendant's ability to form a rational judgement was substantially impaired. He said that none of us know what the defendant was thinking, nor may he have done. Dr Amos' view is that the defendant wanted to have sex with Melissa and the only way he would be able to do that is if he killed her or rendered her unconscious, and this reflects the previous incident with Miss Johnson."
"Dr Amos said that attacking Melissa, Jason knew was wrong and bad but not how wrong. He understood the nature of his conduct. He wanted to have sex with her and knew that he had to incapacitate her. So the doctor was asked, in those circumstances why was that not a rational judgement? Dr Amos said that the defendant approached it from the standpoint that he wanted to have sex with her and the only way he could do that was by incapacitating her, and Dr Amos questioned the rationality of his judgement from the standpoint that defendant had not thought through the consequences."
"'In my opinion' he said, 'there is no evidence to suggest that at the time of the offence he was suffering from a disturbed or abnormal mental state. By this I mean that although he had an abnormal sex drive and difficulty with social communication, he was not deluded, he was able to think rationally, he was not suffering from an abnormal mood state, such as extreme anger, depression or elation, and he was fully aware of what he was doing. 'Analysis of the offence shows that it was a planned, thought out and instrumental assault on a sleeping female who was known to him and who he had previously shown an abnormal interest in."
"'There is nothing to suggest that he was incapable of rational judgement. It is clear that he knew what he was doing was illegal and wrong. He planned to do it so that other people didn't see him. He had planned to conceal what he had done, this implies an ability to think things through, an awareness of his actions and a rational, if morally wrong, choice.' In relation to the exercise of self-control Dr Sandford quoted from his report as follows, 'There is no evidence, in this case, to suggest that Jason lost control of himself, rather he was very much in control of himself. He waited for weeks. He chose his time. That night when unsuccessful in entering her room unseen, he came back and waited two more times. Whilst strangling her he checked her pulse to confirm that she was dead.'"
"Finally, Dr Sandford repeated that it was his opinion that Jason's primary motivation was sexual deviation. He had reached a considered decision. He had been thinking about it and his decision to attack Melissa was based on reason. The fact that the decision was bad or immoral does not make it irrational. The fact that he decided to kill Melissa in order to have sex with her does not make that decision irrational."
"What does 'rational judgement' mean, and how do you apply its meaning to the circumstances of this case? The expression 'rational judgement' has not been defined by the Act of Parliament that creates the defence of diminished responsibility, nor is it an expression used by psychiatrists. Accordingly you should apply the English language definition of the expression, namely 'a considered decision based on reason'."
"In applying the expression 'rational judgement' to this case you are not asking yourselves whether the outcome of the defendant's thought processes was rational, namely the killing of Melissa, so that he could have sex with her, on any view that was an irrational outcome, you must ask yourselves whether the thought processes that led to that outcome were rational. You must concentrate on the process and not the outcome of that process. So the question is, has the defendant established that it is more probable than not that his ability, either to form a rational judgement or to exercise self-control, was substantially impaired?... "