What is insanity?
Labouring under such a defect of reason, from a disease of the mind, as to not know the nature and quality of the act or if he did, he didn’t know what he was doing was wrong
Where is insanity set out?
M’Naghten
What are the 3 key elements?
Defect of reason
Must be more than a momentary confusion (although it can be temporary) and amount to a complete deprivation of reasoning power
Case for defect of reason
Clarke
Disease of the mind
Defect of reason must be due to a disease of the mind, can be mental or physical (has to be internal factor)
Case for disease of the mind
Kemp
Case for epilepsy (disease of the mind)
Sullivan
Case for diabetes (disease of the mind)
Hennessy
Voluntary intoxication
Where D suffers a psychotic episode due to voluntary intoxication, this would be an external factor so would not apply
Case for voluntary intoxication
Coley
Not knowing the nature and quality of the act
Where D is not fully conscious, or if conscious, D doesn’t understand or know what they are doing
Case for not knowing the nature and quality of the act
Oye
Not knowing the act was wrong
D knows nature/quality of their actions, but do not know their actions are legally and morally wrong
Case for not knowing the act was wrong
Keal
What does a ‘special verdict’ of not guilty by reason of insanity result in (for non-murder cases)?
A hospital order, a supervision order or an absolute discharge
Where is the special verdict set out?
Criminal Procedure (Insanity and Unfitness to Plead) Act 1991