Gavin Howe
Self-defence is a defence that permits reasonable force to be used to defend oneself or another. This defence arises from both common law and criminal law. It is a justification defence rather than an excuse. The common law defence of self-defence applies when necessary, reasonable, and proportionate force is used to defend oneself or another from imminent attack. It is a complete defence to all non-sexual offences involving the unlawful use of force. In the United States, self-defence is an affirmative defence that justifies the use of force by one person against another under specific circumstances. In some jurisdictions, there is an imperfect self-defence rule, where an individual who mistakenly believes they were justified in using deadly force in self-defence may have a murder conviction reduced to manslaughter.
| Characteristics | Values |
|---|---|
| Definition | Self-defence is a defence permitting reasonable force to be used to defend oneself or another. |
| Applicability | Self-defence is a justification defence rather than an excuse. |
| Scope | Self-defence applies to all non-sexual offences involving the unlawful use of force, from battery to murder. |
| Reasonableness | The force used in self-defence must be necessary, reasonable, and proportionate to the danger faced. The jury objectively assesses the reasonableness of the force used, not the defendant's subjective belief. |
| Imminent Danger | Self-defence is justified when there is a reasonable belief that unlawful physical force or imminent danger of losing one's life or suffering serious bodily harm is about to occur. |
| No Duty to Retreat | There is no legal duty to retreat, but the opportunity to retreat may be considered when assessing the reasonableness of the force used. |
| Initial Aggressor | The right to self-defence is typically lost if the accused was the initial aggressor, provoked the attack, or engaged in mutual combat. However, some jurisdictions allow self-defence if the accused withdraws in good faith before the offence occurs or if the opposing party escalates the conflict. |
| Intoxication | Self-defence may not be applicable if the defendant was voluntarily intoxicated, as in the case of Hatton. |
| Homeowner's Defence | Homeowners may rely on self-defence if the force used is unreasonable but not grossly disproportionate, as clarified by the Crime and Courts Act 2013 in the UK. |
| Third-Party Defence | Lethal force may be justified to defend a third party, especially household members, if there is a reasonable belief that the third party is in imminent danger of death or serious injury. |
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What You'll Learn
The defence of self-defence is readily understandable by a jury
The defence of self-defence is a straightforward concept that can be readily understood by a jury. It involves no complex legal theory and only requires common sense to understand and apply. The basic principle is that a person who is attacked may defend themselves, but only to the extent that is reasonably necessary. This means that the force used in self-defence must be proportionate to the danger posed and the particular circumstances of the situation. For example, it would not be considered reasonable to use deadly force in response to a minor attack that does not pose an imminent threat of serious harm.
The defence of self-defence is a justification defence, which means that it provides a complete defence to criminal charges if the defendant's actions are found to be justified. In the context of self-defence, this typically applies to non-sexual offences involving the unlawful use of force, such as battery or murder. The key question is whether the defendant's use of force was necessary, reasonable, and proportionate in the specific circumstances.
The determination of whether the defendant's actions were reasonable will be assessed objectively by the jury, taking into account all the relevant facts and circumstances. This includes considering the severity of the attack, the defendant's perception of the threat, and whether there was an opportunity to retreat or take alternative action. While there is generally no duty to retreat, the failure to do so when possible may be taken into account when assessing the reasonableness of the force used.
It is important to note that the right to self-defence is not absolute. For example, initial aggressors or those involved in mutual combat may lose the right to claim self-defence, unless they have withdrawn in good faith before the offence occurred. Additionally, self-defence cannot be used as a justification if the defendant was voluntarily intoxicated and killed someone based on a mistaken belief induced by their intoxication.
In summary, the defence of self-defence is based on the understandable principle that individuals should be able to defend themselves from harm, but only to the extent reasonably necessary. Juries are well-equipped to apply this defence by assessing the specific facts and circumstances of each case and determining whether the defendant's actions were justified.
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The use of force must be proportionate to the danger
The use of force in self-defence must be proportionate to the danger faced. This principle is known as the "proportionality principle" and it requires that the force used to defend oneself or another must be necessary, reasonable, and proportionate to the threat posed.
The proportionality principle is a key component of self-defence laws in many jurisdictions, including common law countries. It recognises that while individuals have a right to defend themselves and others from harm, the force used must not exceed what is reasonably necessary to neutralise the threat. This means that the force used in self-defence should be commensurate with the severity of the danger posed and the level of force used by the aggressor.
For example, if someone is facing a minor attack or threat, using deadly force would likely be considered disproportionate and excessive. In such cases, a court may determine that the defender's actions were not reasonable or necessary and, therefore, not justified under self-defence laws. On the other hand, if someone is facing imminent danger of death or serious bodily harm, the use of deadly force may be deemed proportionate and, thus, a legitimate act of self-defence.
It's important to note that the interpretation of "proportionality" can vary depending on the specific circumstances of each case. Factors such as the relative size and strength of the individuals involved, the presence of weapons, and the specific actions of the aggressor can all influence the determination of whether the force used in self-defence was proportionate.
In some jurisdictions, the proportionality principle is explicitly stated in self-defence laws, while in others, it may be interpreted through case law and judicial decisions. Additionally, the specific requirements for claiming self-defence, including the proportionality of force, may differ between jurisdictions for homicide and non-deadly force cases.
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The right to self-defence is lost if the accused was the aggressor
Self-defence is a legal concept that allows a person to use reasonable force to protect themselves or others from harm. It is a justifiable defence in criminal law, but it has specific limitations and conditions that must be met for it to apply. One critical aspect is that the right to self-defence is forfeited if the accused was the initial aggressor in the situation. This means that if a person instigates or escalates a conflict, they cannot later claim self- defence as a justification for their actions. The principle behind this is that the law does not allow individuals to benefit from their wrongdoings or escape the consequences of their own unlawful actions.
Being the aggressor does not always refer to physical violence. It can also include verbal threats, menacing behaviour, or any action that a reasonable person would perceive as a threat. For example, if a person verbally abuses and taunts someone, then the victim responds with physical force, the initial aggressor cannot claim self-defence. Similarly, if a person raises a fist or brandishes a weapon, these actions could be seen as aggressive, and if a conflict ensues, the instigator cannot later claim they were acting in self-defence.
The loss of the right to self-defence also applies if the accused was the 'secondary' aggressor. This means that even if someone was not the first to use force, but they respond with excessive or unreasonable force, they become the aggressor and lose the right to claim self-defence. For example, if two people are in a verbal argument and one pushes the other, if the person pushed then pulls out a weapon and seriously injures the first person, they are now the aggressor and cannot claim self-defence.
The concept also considers the principle of 'proportionality'. This means that the level of force used in self-defence must be reasonable and proportional to the perceived threat. If an aggressor uses excessive force, they can be considered the new aggressor and lose the right to self-defence. For example, if someone is pushed and they respond by shooting the pusher, the level of force is disproportionate to the initial threat, and the shooter would be considered the aggressor.
It is important to note that the loss of self-defence rights does not apply if the accused was the aggressor, but they subsequently withdrew from the conflict. Withdrawal must be communicated to the other party, and it must be clear and unequivocal. If the other party then continues the conflict, the initial aggressor may be able to claim self-defence if they used reasonable force to protect themselves.
In summary, the right to self-defence is a critical aspect of criminal law, but it is not an unlimited right. If a person instigates or escalates a conflict, they lose the privilege to claim self-defence as a justification for their actions. This is a key consideration in common law self-defence, and it underscores the principle that individuals must act responsibly and within legal boundaries when defending themselves or others.
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The use of deadly force to defend a third person
Self-defence is a defence that permits the use of reasonable force to defend oneself or another. This defence arises from both common law and the Criminal Law Act 1967. It is a justification defence, and if successful, results in a complete acquittal.
However, it is important to note that the use of deadly force must be proportionate to the danger. If non-deadly force appears to be sufficient to protect the third person, then the use of deadly force may not be justified. The defendant must only use the amount of force that reasonably appears necessary under the circumstances.
There is some disagreement as to whether the defendant must have a relationship with the third person they are defending. Some jurisdictions require a special relationship, such as a parent-child or husband-wife relationship, while most jurisdictions do not require any relationship at all.
Additionally, the use of deadly force in defence of habitation or property may be justified in certain circumstances. For example, in the United States, the "make my day" law in Colorado allows the use of deadly force against an intruder who has entered or is in the process of entering a residence.
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The duty to retreat before using force
The duty to retreat is a legal principle that requires individuals to attempt to withdraw or escape from a threatening situation before resorting to the use of force, especially deadly force. This principle prioritises de-escalation and conflict avoidance, emphasising the preservation of life by avoiding the use of violence whenever possible. The duty to retreat encourages individuals to remove themselves from confrontation if it can be done safely, and it can be applied in situations where the use of force can be safely avoided.
The duty to retreat is not a universal legal requirement and varies by jurisdiction. In some states, there is no duty to retreat, and individuals are permitted to use force, including deadly force, if they reasonably believe it is necessary for self-defence. These laws, often referred to as "stand your ground" laws, contrast with duty to retreat laws. The interpretation of "reasonable retreat" can be subjective and lead to legal complications and uncertainties.
The duty to retreat can be influenced by factors such as the location of the incident and the individual's ability to escape. For example, in the case of R v Bird, the defendant reacted instinctively and immediately to a physical attack without having the opportunity to retreat. Their immediate reaction was interpreted as self-defence rather than revenge. In certain states, the Castle Doctrine may eliminate the duty to retreat if an individual is in their own home or any place where they have a legal right to be.
While the duty to retreat prioritises de-escalation, it can also limit an individual's right to defend themselves in critical situations, potentially placing them at a disadvantage. In some cases, retreating may strengthen an individual's legal position if force is ultimately required, demonstrating their commitment to avoiding violence. It is important for individuals, especially gun owners, to be aware of the specific regulations in their jurisdiction to ensure compliance with the law and understand their rights and responsibilities in self-defence situations.
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Frequently asked questions
Common law self-defence is a defence that permits the use of reasonable force to defend oneself or another from imminent attack. This defence applies to all non-sexual offences involving the unlawful use of force.
The force used in self-defence must be necessary, reasonable, and proportionate to the danger faced. The person defending themselves cannot be the initial aggressor and must generally attempt to retreat or de-escalate the situation if possible.
In some jurisdictions, statutory laws, also known as "stand your ground laws", explicitly remove the duty to retreat before using force. In these cases, the reasonableness of the force used may still depend on whether it was safe to retreat or if the incident occurred at the defender's home.
Yes, in cases of homicide, an individual has the right to self-defence if they reasonably believed they were facing imminent danger of death or grievous bodily harm and that the force used was necessary for protection. However, the use of deadly force must be justifiable, and the defender cannot be the initial aggressor.
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