General defence of Insanity Flashcards
Which set of rules governs insanity
M’Naghten Rules
How did the HL explain the rules regarding insanity
Everyone is presumed to be sane until proved otherwise.
Who must prove the defence
D on the balance of probabilities
What are the three elements of the M’Naghten Rules
D must show;
1) Has a disease of the mind
2) Has a defect of reason as a result of the disease
3) either did not know the nature and quality of the act or as a result he did not know that what he was doing was wrong
How is a disease of the mind interpreted/ what does it mean
widely, any disease which affects the mind
What is mind interpreted as
Matter concerning reasoning, memory and understanding
Is there a distinction between disease of mind and body
No, similar there is no distinction between metal and physical illness
What was decided in R V Kemp
D suffered from hardening of the arteries which caused temporary unconsciousness
This had affected his mind therefore it could be classed as a disease of the mind.
Epilepsy is not classed as instant in medical terms but it is in legal terms case
R V Sullivan
R V sullivan case facts
Epileptic charged with GBH, medical evidence showed he was not aware of what he was doing.
D wanted to use non-insane but Judge decided because was an internal factor the jury could consider insanity
D changed he plea to guilty and was convicted, appealed but HL upheld conviction that epilepsy was a disease of the mind because D’s mental faculties where impaired
Legal principles from R V sullivan
1) Epilepsy is a disease of the mind because D’s mental faculties where impaired
2) The disease does not need to be permanent as long as it existed at the time of the act
R V Hennessy facts
Diabetic who suffered from anxiety and stress. The stress affected his blood sugar levels so he needed more insulin which he failed to take and committed a driving offence.
D argued non-insane caused by external factors (stress and anxiety)
Judge said it was a direct result of diabetes (Internal) so the jury could consider insanity
D changed plea to guilty and was found guilty, appealed but conviction upheld
D had hyperglycaemia
Legal principles from R V hennessy
1) The factor was internal and gave D the defence of insanity because it was likely to recur
R V Quick case facts
D was a nurse and accused of assaulting a patient.
Diabetic who took insulin but then failed to eat, since an external factor had caused his problems he did not fall into the M’Naghten Rules because the insulin had caused his behaviour not a disease itself
Hennesy was distinguished from R V quick since quick had hypoglycaemia
Quicks conviction was quashed
What is HYPOglycaemia
Low blood sugar caused by taking too much insulin or failing to eat after
What defence would be allowed by hypoglycaemia
Non-insance because the insulin is at fault not the disease of the mind therefore it is an external factor
What is HYPERglycaemia
High blood sugar level caused by failure to take insulin