17 Another issue that was left to the jury, and rejected, was the partial defence of Substantial Impairment by Abnormality of Mind. In this connection and because there was also an issue as to whether, particularly in light of his mental condition and the alcohol he had consumed, the Prisoner formed either of the intents necessary for murder, evidence was given by Dr Pullman a clinical neuro-psychologist, and by 2 psychiatrists Dr Wong and Dr Westmore. Dr Pullman's assessment of the Prisoner was that he had a mild intellectual disability probably existing from childhood. She agreed that persons with such a disability sometimes have difficulty in responding appropriately to provocation when they feel the sensation of anger, that they may not have the abstract conceptual reasoning ability to think through what they are doing, they may not think as quickly as others and may not think through all of the consequences as someone normal may do.
18 Dr Wong also accepted that the Prisoner suffered from mild mental retardation although Dr Westmore regarded the level of intellectual disability as mild to moderate. Against quotients of 90 to 100 for persons in the normal range, 80 to 90 for persons below average, 70 to 80 for borderline, the Prisoner's IQ was assessed as 60 or thereabouts.
19 Evidence was given, and a history to similar effect provided to the doctors, to the effect that the Prisoner had a tendency when annoyed to punch walls, including brick walls, and a punching bag; on one occasion he had punched a mirror and on another punched a friend who had touched the Prisoner's partner on the breast. Details of the last mentioned incident were not regarded as sufficient to form the basis of any conclusion but Dr Wong was disinclined to regard the others as indicating that the Prisoner was abnormally lacking in self-control. Dr Westmore said that the incidents demonstrated control insofar as the Prisoner did not hit his partner, though dis-control in that he hit walls. I prefer the view of Dr Westmore.
20 Talking more generally, although agreeing that the intellectually disabled have a higher degree of emotional abnormalities, Dr Wong said that intellectual disability per se does not argue for the existence of lesser self-control. Dr Westmore said that the ability to maintain self-control may be less for those intellectually disabled.
21 Dr Wong said that to the extent the attack on the deceased demonstrated a lack of self-control, this was likely to be the result of intoxication albeit also saying that the Prisoner was likely to have developed a considerable tolerance for alcohol and that there was no evidence given to him that the Prisoner was severely intoxicated at the time or that the Prisoner had consumed more than he normally did. The doctor observed that the Prisoner had informed him that he lost his temper more readily when under the influence of alcohol and someone annoyed him.
22 Although conceding that it was possible that the Prisoner's intellectual disability was the primary reason for his lack of self control in the attack on the deceased, Dr Westmore said that there was no sensible way that alcohol "a substance which is known to impair judgment and cause disinhibition" could be excluded as an operative factor in the Prisoner's actions and that in his view alcohol along with provocation played an immediate and direct role in the Prisoner's offending behaviour. Dr Westmore said also that those with intellectual disabilities are more prone to the effects of alcohol.
23 There was also tendered during the sentence hearing a report from Emma Collins, a psychologist. Ms Collins recounted earlier testing which revealed the Prisoner to be at the very bottom of the borderline range of intellectual functioning and having very poor cognitive ability. She herself sought to undertake some personality testing but felt obliged to discontinue her efforts due to the Prisoner's inability to understand. Ms Collins' conclusions include the following:-
"Mr Tuigamala impresses as someone who lacks reasonable impulse control. This is suggested from the cognitive testing completed by Dr Reid, his deteriorating behaviour and general presentation during the assessment. Due to his poor cognitive functioning, Mr Tuigamala appears to lack the necessary resources to regulate his behaviour and is subject to irrational and impulsive behaviour. His alcohol use particularly with regards to the current offence, acted as a disinhibitor in relation to his aggressive conduct. Furthermore, his exposure to violence from an early age normalises the use of aggression as a means of coping and control, and Mr Tuigamala simply does not have the internal mechanisms to regulate the expression of such behaviour. A synthesis of an early introduction to violence, reduced intellectual ability and alcohol abuse are integral factors in his impulse difficulties and as such, resulted in his criminal conduct."
24 Relevant also to a determination of the objective seriousness of the offence are some of the matters in the Prisoner's history. Although many aspects of that history are relevant to only subjective factors, it is convenient to refer to all at this stage. The Prisoner did not give evidence on sentence but much of his history has been provided sufficiently often to the various experts he has seen to persuade me it is reliable.
25 He was born in Samoa in August 1977 as one of 10 children. He was beaten regularly by his father, commonly for truanting from school. The Prisoner said that this form of discipline was conventional in that culture although believes that it was, in his case at least, excessive. He was sent to Sydney in 1993 to live with an aunt and uncle and to enable him to send money back to his family. The prisoner said that he had a good relationship with his aunt and uncle and their 4 children. His uncle however died in 1996 and this seems to have had a significant effect on the Prisoner who thereafter experienced depressive symptoms and a loss of interest in things. The Prisoner left his uncle's family in 1997 and has lost contact with them.
26 In Samoa the Prisoner found learning difficult. Learning difficulties continued in Australia and the Prisoner left school after year 9. Thereafter he has had a fairly consistent work history working as a labourer, a storeman, and making furniture, and in order to send money to his family.
27 The prisoner began substance abuse in 1997, binge drinking and using cannabis and amphetamines. These habits continued until his current incarceration. Ms Collins opined that, had the Prisoner not been arrested, this use would probably have escalated to a state of dependency. The Prisoner established a de facto relationship in about 2001, a relationship that has been productive of 2 children.
28 His partner also gave evidence of, additional to the episodes of wall punching to which I have referred, a habit of the Prisoner on receiving mail to throw it down in frustration with words to the effect, "You read it".
29 The Prisoner has a minor criminal record consisting of convictions, in 1997 on one count of malicious damage and one of stealing, in 1999 on one count of aggravated robbery with wounding and one of robbery in company, in 2000 on one count of affray and one of resisting a police officer in the execution of his duty, and in 2002 on one count of driving with a prescribed concentration of alcohol in the mid-range, and one of driving although never licensed. For the 2000 offences the Prisoner was sentenced to imprisonment for 12 months including a non-parole period of 4 months, both periods commencing on 31 March 2000. For the 2 robbery offences, the Prisoner was sentenced in April 1999 to concurrent terms of imprisonment for 3 years including non-parole periods of 6 months.
30 Although some of these offences includes elements of violence, having regard to the absence of any evidence that they were the result of loss of self-control or, except for one driving offence caused by alcohol and to the gap between 2000 and September 2003, I do not regard the Prisoner's history as of any significance other than as indicating that he does not come before the court with an exemplary history.