The Insanity Defence, in Need of Reform?

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Introduction

1. The concept of insanity and its possible use as a defence in the negation of criminal liability first appeared in R v Arnold. Tracy J put forward that if an offender is "totally deprived" of their "understanding and memory", then they should never be subject to punishment. The notion of criminal insanity was further developed in R v Hadfield. This case lead to The Criminal Lunatics Act 1800 being passed; to allow for the detention of insane individuals.

2. This report will concern itself, however, with the current law and it's efficacy for dealing with the 'insane'. At present, the definition of the insanity defence is found in the 'M'Naghten Rules'. To establish a defence of insanity,

"...it must be clearly proved that, at the time of the committing of the act, the party accused was labouring under such a defect of reason, from disease of the mind, as not to know the nature and quality of the act he was doing; or, if he did know it, that he did not know he was doing what was wrong."

It lies with the defendant to prove that on the balance of probabilities that they fall within the confines of the test, and are thus insane. If proven, the individual is found 'not guilty by reason of insanity' (NGRI) and is at the 'disposal' of the court, meaning they can be discharged, given a supervision order or detained within a psychiatric institution.

3. The 'M'Naghten Rules' on insanity have various shortcomings. Firstly, it is not clear whether the insanity defence available to all defendants. Secondly, the current law is, in various ways, incompatible with modern psychiatric and medical understanding. Additionally, describing a defendant as 'insane' is outdated and offensive. ...

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...d, 2009) 94-95
Law Commission, 'Criminal Liability: Insanity and Automatism', (Discussion Paper) paras 1.52-1.62 ibid para 1.62
Law Commission, 'Criminal Liability: Insanity and Automatism', (Discussion Paper) para 1.61, citing/referring to; N Sartorius, “Stigma of Mental Illness: A Global View” in L B Cottler (ed), 'Mental Health in Public Health: the Next 100 Years' (2011) p 213-222 & H Schulze, 'Reducing the Stigma of Mental Illness: A Report from a Global Programme of the World Psychiatric Association' (2005)
Convention for the Protection of Human Rights and Fundamental Freedoms (European Convention on Human Rights, as amended) (ECHR), Art 5(1)(e)
Winterwerp v The Netherlands (1979) 2 E.H.R.R. 387 ibid Criminal Procedure (Insanity and Unfitness to Plead) Act 1991, Orders for Admission to Hospital
Domestic Violence, Crime and Victims Act 2004, s24

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