On the last element above, it is apposite to observe, although not relevant to the present case, that there has been a change in the wording of Exception 7, the implications of which are not entirely clear. The version of Exception 7 that the Accused was charged under referred to a substantial impairment of “mental responsibility”. This is in contrast to the current version of Exception 7 in the Penal Code 1871 (2020 Rev Ed) which, having come into force on 1 Jan 2020 by virtue of the Criminal Law Reform Act 2019 (Act 15 of 2019), has abandoned the reference to “mental responsibility” in favour of spelling out a requirement of a substantial impairment to: (a) the offender’s capacity to know the nature of his acts; (b) the offender’s capacity to know whether his acts are wrong; and (c) the offender’s power to control his acts. It is not clear if Exception 7, as it currently stands, is confined to these three categories of impairment specifically. In the Penal Code Review Committee, Report (August 2018) (“PCRC Report”), the Penal Code Review Committee stated that the change in the wording of Exception 7 was clarificatory in nature, and not intended to effect any substantive change in the law as it then stood (at p 321). In this regard, earlier obiter dicta in Court of Appeal authority had suggested that the concept of “mental responsibility” was not confined to the three types of capacity set out in R v Byrne [1960] 2 QB 396 (which roughly track the three categories of impairment set out in the current version of Exception 7) (see Public Prosecutor v Wang Zhijian and another appeal [2014] SGCA 58 at [67]; Nagaenthran a/l K Dharmalingam v Public Prosecutor and another appeal [2019] 2 SLR 216 at [25]–[26]; Ahmed Salim at [35]). However, no reference to such dicta was made in the PCRC Report, and it is not entirely apparent if the wording of the current version of Exception 7 can sustain a non-exhaustive interpretation, as it tends on a plain reading towards an exhaustive interpretation. Furthermore, the Explanatory Statement to the Criminal Law Reform Bill (No 6 of 2019) states that the purpose of the amendment was “to define diminished responsibility in terms of an abnormality of mind that substantially impaired [the three types of capacity stated in the provision]” [emphasis added]; the word “define” suggests that the three categories of impairment enumerated in Exception 7 are exhaustive of the scope of the diminished responsibility defence. Nevertheless, as nothing turned on this distinction in the present case – given that the Accused was charged and tried under the former version of Exception 7 that referred to “mental responsibility” – I say no more on this issue, and merely highlight it as a point that might attract treatment by counsel or clarification by the court in a suitable future case.