The standard of proof upon the accused raising the defence of insanity is on a balance of probabilities, as in a civil case (Rajagopal v. PP [1976] 1 LNS 122; [1977] 1 MLJ 6, Goh Yoke v. PP [1969] 1 LNS 48; [1970] 1 MLJ 63). So, if the Appellant here is able to show, either from the prosecution or other evidence that he committed the crime but was at that time insane, he cannot be culpable by virtue of s. 84 Penal Code. [17] Similarly, the Court of Appeal through the judgment of Suriyadi Halim Omar JCA (as he then was) in Kofri Mustafar v. PP [ 2010] 9 CLJ 519, when addresing the same provision expressed the same sentiments further said: [18] Section 84 of the Penal Code legislates that nothing is an offence which is done by a person who, at the time of doing it, by reason of unsoundness of mind, is incapable of knowing the nature of the act, or that he is doing what is either wrong or contrary to law. Even though the Appellant has alluded to the term 'insane' in his submission, the phrase promulgated in s. 84 is 'unsoundness of mind'. "Insanity" which speaks of 'disease of the mind', is a term used in Mc Naghten [1843] 10 Cl & Fin 200 or generally referred to as Mc Naghten's Rule. [19] Section 84 demands that: i. at the time of doing it; ii. the person by reason of unsoundness of mind; iii. is incapable of knowing; iv. the nature of the act; or v. that he is doing what is either wrong or contrary to law. [20] Two limbs entitle him to an acquittal. First, if at the time of doing the act, by reason of unsoundness of mind, he did not know the nature of the act, or if he knew the nature of the act did not know that it was either wrong or contrary to law (Criminal Law in Singapore and Malaysia Text and Materials by KL Koh, CMV Clarkson and NA Morgan). For purposes of this appeal, the crucial time of having an unsound mind therefore is at the time of the brutal attack, and not before or after the act (John Dawlat Moon [1927] 29 Cr LJ 393); [1928] AIR (P) 363). A plea of unsoundness of mind at the time of trial will not avail an accused person (Nota Ram [1866] PR No 56 of 1866; The Law of Crimes by Ratanlal, p. 165). Regardless of the other relevant prerequisites of s. 84, it is incontrovertible that unless this preliminary factor of unsoundness of mind is established first, this defence cannot prevail. [21] It is established law that the burden of proof lies on the Appellant that is if he wishes the court to believe that he was of unsound mind at the time when he committed the offence. Needless to say, this defence of unsound mind needs to be established at the earliest possible moment ie, at the prosecution's stage. This is to avoid any allegation of afterthought. [22] Under s. 105 of the Evidence Act, the legal burden is on the Appellant to establish the fact that he committed the act in a moment of unsound mind (Jayasena v. R [1970] 1 All ER 219). In an English case, Woolmington v. DPP [1935] AC 462) the court reiterated that for a defence of insanity, the legal burden of proof on the balance of probability, is placed on an accused person. Our Decision [18] The crucial issue which lies at the heart of this appeal is the order of acquittal at the end of the prosecution’s case after the learned trial judge had indeed satisfied in his finding that the Respondent had committed the act specified in the charge. Despite that finding, the learned trial judge acquitted and discharged the Appellant without his defence being called at all. With respect, learned trial judge had patently fell into error by deciding an outright acquittal. [19] Undoubtedly, his reasons for doing so was based on the considerable weight he had given to the medical testimony of SP7, SP7’s medical report (P42) and D26, the deceased Jinjang Police Report No: 3469/20 dated 17/2/2020 received in evidence in concluding that the Respondent was insane at the time he committed the act. As a result of which, the learned trial judge ordered the Respondent to be detained at the Hospital Bahagia Ulu Kinta, Tanjung Malim, Perak for further treatment as provided under section 348 Criminal Procedure Code for treatment. [20] Much had been strenuously canvassed before us by the learned counsel for both sides to this important point. The question which arises in our instant appeal is whether it was open for the learned trial judge to order the acquittal at this stage of the trial upon relying on such medical evidence standing alone before the court. [21] Having being satisfied that the offence of murder had been established by the prosecution, it is incumbent upon the learned trial judge to direct the Respondent to state his defence. Failure to do so render his ultimate decision fatally flawed. To our mind, it is premature for him to dealt with the medical situation at this stage. The learned trial judge should refrain from making decision of an acquittal at the close of the case for the prosecution. He should have continued with the trial and hear the defence version. By primarily focusing his judicial mind on SP7’s expert opinion and factual evidence as to the circumstances leading to SP2’s mother's death, which led to his conclusion thereon, the learned trial judge had fallen into a serious error of law warranting appellate intervention. [22] For the Respondent to earn an acquittal, learned trial judge armed with the facts, will have to consider and evaluate from all angles whether by reason of medical insanity, the Respondent was incapable of knowing the nature of his act or that what he was doing was either wrong or contrary to law only until the end of the trial after the defence has given evidence and close its case. Unfortunately, this did not take place here. [23] For completeness, however, if the Respondent elected to remain silent and called no evidence, the court must convict him since the hypothetical position obtained pursuant to section 180 of the Criminal Procedure Code that the prosecution evidence would not and could not be challenge or rebutted, has become a reality. [24] In this context, it is pertinent to emphasise that at the prosecution stage, expert medical opinion assumed little value or significance as the question of whether the Respondent was incapable of knowing the nature of his act or that he was doing what was either wrong or contrary to law is a matter to be inferred from the proved facts and circumstances and not from expert medical opinion. Legal insanity is not for the medical witnesses to decide however eminent they may be. That onus is upon the defence and it is to satisfy the court on the balance of probabilities. It is purely a question of fact which rests upon substratum of oral evidence, the credibility of which is entirely for the learned trial judge to determine after the close of the defence’s case with the aid of the medical evidence. Conclusion [25] Having regard to all the foregoing reasons and after a careful scrutiny of the notes of proceedings of the trial and the submissions made, we unanimously allowed the Appellant appeal. The orders of acquittal and discharge is set aside. The case to be remitted to the Kuala Lumpur High Court before the same judge for continuation of the trial and the Respondent to be called to enter upon his defence. The Respondent is to be remanded in prison until trial. Date: 11 December 2023 - sgd - Azmi bin Ariffin Judge Court of Appeal Malaysia Counsel For the Appellant : Tan Guat Cheng (GC Tan & Co. (Penang)) For the Respondents : Eyu Ghim Siang (Deputy Public Prosecutor)