Law-Defences Flashcards
What are the defences?
Insanity, automatism, intoxication, self-defence and consent
What are the rules on insanity based on?
The case of M’Naghten who suffered from extreme paranoia and killed his secretary but due to mental state he was found not guilty. He was sent to a mental hospital but not due to the verdict. Because he was not guilty and not automatically sent to a hospital, he house of lords created the M’Naghten rules on insanity to answer the publics questions
What is the main rule on insanity?
“in all cases every man is presumed to be sane and to possess a sufficient degree of reason to be responsible for his crimes”
How is the defence of insanity established?
The defendant must prove that at the time of committing the act he had a defect of reason which is the result of a disease of the mind which causes the defendant not to know the nature and quality of his act, or not to know he was doing wrong
For insanity, what is the burden and standard of proof?
The burden of proving insanity is on the defence, who must prove it on the balance of probabilities
When a defendant is found to be insane, what verdict is given?
Not guilty by reason of insanity
What did the case of DPP v H decide?
Defendant was charged with driving with excess alcohol and it was held that insanity is not a defence to offences of strict liability where no mental element is required
What is defect of reason?
It means that the defendant’s powers of reasoning must be impaired. If the defendant is capable of reasoning but has failed to use those powers then this is not a defect of reason (Clarke)
What happened in the case of Clarke?
It was decided that the defect of reason must be more than absent-mindedness or confusion
What is disease of the mind?
The defect of reason must be due to a disease of the mind, which is a legal term, not a medical one. The disease can be a mental disease or physical disease which affects the mind eg Kemp, Sullivan, Hennesy, Burgess
What happened in the case of Kemp?
Defendant was found not guilty by reason of insanity due to a hardening of the arteries which caused a problem with supply of blood to the brain causing moments of temporary loss of consciousness. Court ruled it was insanity because they are interested in illnesses that affect the mind, not the brain, which is why it counted
What happened in the case of Sullivan?
Defendant had epilepsy, known to have fits and aggression to those trying to help during these times, and in this case injured an 80 year old man
What did the House of Lords rule in the case of Sullivan?
They ruled that the source of the disease was irrelevant. It could be ‘organic, as in epilepsy, or functional’, and it did not matter whether the impairment was ‘permanent, or transient and intermittent’, provided that it existed at the time that the defendant did the act. This means that for the purpose of the M’Naghten Rules the disease can be of any part of the body provided it has an effect on the mind. This extended the legal meaning of insanity far beyond the medical meaning
What happened in the case of Hennessy?
High blood sugar levels because of diabetes were classed as insanity because the levels affected the mind. Therefore the source of the disease can also be ‘organic’, meaning a disease of the organs of the body, including diseases such as epilepsy, arteriosclerosis (Kemp), brain tumours and diabetes
What happened in the case of Burgess?
It was decided that in some instances sleep-walking was also within the legal definition of insanity. It was found that the defendant was sleep walking due to a sleep disorder (an internal cause) and so was found not guilty by reason of insanity. However if the sleep walking is due to an external cause, such as a blow to the head then it is not insanity but will allow the defendant the defence of automatism
What happens if the defect of reasoning in caused by an external factor?
This is not insanity, as shown by Quirk who was diabetic which may be insane if insulin hasn’t been taken (Sullivan), but may not be insane if they have taken insulin but haven’t eaten as this counts as an external factor. If a drug hasn’t been taken and the disease causes the problem, then it is internal (disease of the mind). But if a drug has been taken and this causes the automatic state, then it is external and not insanity
What is ‘not knowing the nature and quality of the act or not knowing that it is wrong’?
Nature and quality refers to the physical character of the act. The two ways that the defendant may not know the nature of quality of the act are because they are in a state of unconsciousness or impaired consciousness, or where they are conscious but due to their mental condition they don’t understand or know what they are doing. If either of these ways can be proven to apply at the time of the act, then this part of the M’Naghten rules is satisfied
What was the case for Kemp, Sullivan, Hennessy and Burgess relating to whether they knew the nature and quality of their act, or whether it was wrong?
The defendant may not know the nature and quality of the act because they are in an automatic state and they don’t know what they are doing, which was the case in Kemp, Sullivan, Hennessy and Burgess
What is a reason, apart from being in an automatic state, that someone may not know the nature or quality of their act?
If they suffer from delusions. If a person believes eg that the devil is standing next to them and hits out at them with a knife but in actual fact kills a person, they don’t know the nature or quality of the act. The same is true if an insane person believes they are squeezing an orange but in fact they are squeezing someone’s throat
How is it possible for someone who knows the nature and quality of their act to use the defence of insanity?
I they did not know that what they did was wrong (meaning legally wrong, not morally wrong). Even if the defendant is suffering from a mental illness but knows what they did was legally wrong, they cannot use the defence of insanity, as shown by Windle
What happened in the case of Windle?
Defendant killed his suicidal wife and gave himself up to the police then said “I suppose they will hang me for this”. He had a mental illness but his words showed that knew he had done something legally wrong and so could not use the defence of insanity
What case followed Windle more recently?
Johnson, where the defendant was schizophrenic and stabbed a neighbour in their flat. Two psychiatrists said he was paranoid schizophrenic with hallucinations but both agreed that despite this, he still knew the nature and quality of his acts, and that they were legally wrong so could not use insanity
What is a major problem with the law of inanity?
The definition of insanity was set by the M’Naghten rules in 1842. At that time medical knowledge of mental disorders was very limited. Much more is known today about mental disorders and a more modern definition should be used
What are the other problems with the law of insanity?
Other problems with the legal definition of insanity, the overlap with automatism, the position of diabetics, the decision in Windle, social stigma, and proof of insanity