# Critically discuss whether the free, voluntary and informed acts of a victim or third party clearly break the chain of causation
## Introduction
In criminal law, establishing causation is a fundamental requirement for proving guilt in all result crimes. The prosecution must demonstrate both factual and legal causation, linking the defendant’s conduct to the prohibited consequence. Factual causation is established using the ‘but for’ test (R v White, 1910), but legal causation is more complex. It requires the defendant’s act to be an ‘operating and substantial’ cause of the result (R v Pagett, 1983). However, this chain of causation can be broken by a *novus actus interveniens* – a new intervening act. The leading principle is that a “free, voluntary, and informed” act by a responsible person will sever the chain of causation (R v Kennedy (No 2), 2007). This essay will argue that while this principle provides an apparently clear starting point, its application in cases involving victims and third parties is not always straightforward, with judicial policy and foreseeability creating significant areas of uncertainty.
## The ‘Free, Voluntary, and Informed’ Principle
The modern authority on intervening acts is the House of Lords decision in *R v Kennedy (No 2)* (2007). In this case, the defendant supplied a prepared syringe of heroin to the victim, who then voluntarily self-injected and died. The court held that the victim’s free, voluntary, and informed act of self-injection was a *novus actus interveniens* which broke the chain of causation, quashing the defendant’s conviction for manslaughter. The principle articulated is that individuals are autonomous and are held responsible for their own actions. Therefore, where a person with free will performs a positive act or omission, that act will be seen as the cause of the subsequent consequence. This seems to provide a clear and simple rule for determining legal causation. However, when applied to different factual scenarios, particularly those involving the acts of victims and third parties, its clarity diminishes.
## Acts of the Victim
The clarity of the *Kennedy (No 2)* principle is challenged by cases involving a victim’s reaction to the defendant’s conduct. In cases of escape, the victim’s act may not be considered entirely free or voluntary. In *R v Roberts* (1971), a victim jumped from a moving car to escape the defendant’s unwanted sexual advances. The court held that her act did not break the chain of causation because it was a reasonably foreseeable reaction to the threat posed by the defendant. The chain would only be broken if the victim’s reaction was “so daft… or so unexpected… that no reasonable man could be expected to foresee it”. This introduces a test of foreseeability, which is less precise than the ‘free, voluntary, and informed’ standard. The victim in *Roberts* chose to jump, but her choice was constrained by the defendant’s actions, and therefore was not truly ‘free’.
Furthermore, the ‘thin skull’ rule represents a significant policy-based exception. This rule dictates that a defendant must take their victim as they find them. In *R v Blaue* (1975), a Jehovah’s Witness was stabbed and refused a blood transfusion that would have saved her life. The defendant argued that her refusal, a conscious and informed decision based on her religious beliefs, broke the chain of causation. The Court of Appeal disagreed, holding that the defendant must accept the victim’s physical and psychological characteristics, including their beliefs. This decision sits uneasily with the principle in *Kennedy (No 2)*, as the victim’s decision was undoubtedly free, voluntary, and informed. The courts here prioritise a policy of protecting victims over the strict application of the causation principle, showing that the rule is not as clear as it first appears.
## Acts of a Third Party
The acts of third parties can also intervene, but again, the ‘free, voluntary, and informed’ test is applied with qualifications. Responsive acts by a third party, undertaken in reaction to the defendant’s wrongdoing, will generally not break the chain of causation. In *R v Pagett* (1983), the defendant used his pregnant girlfriend as a human shield while shooting at armed police. The police returned fire, killing the girl. The court held that the police officers’ actions were a foreseeable and reasonable act of self-defence in response to being fired upon. Their actions were not ‘free’ in the sense required to break causation, so the defendant remained liable for her death.
Medical negligence provides another complex area. The general rule is that medical treatment, even if negligent, will not break the chain of causation unless it is “so independent of the defendant’s act and in itself so potent in causing death” that it renders the defendant’s contribution insignificant (R v Cheshire, 1991). This is a very high threshold. In *Cheshire*, the victim’s death was caused by negligent medical care following a shooting by the defendant, but the defendant’s conviction was upheld because the original wounds were still an operating cause. Only in exceptional cases, such as *R v Jordan* (1956), where the treatment was ‘palpably wrong’, has medical intervention been held to break the chain. This high bar demonstrates that the courts are reluctant to allow medical professionals’ actions, which are rarely truly ‘free’ but are responses to the defendant’s act, to absolve a defendant of liability.
## Conclusion
In conclusion, the principle that a free, voluntary, and informed act will break the chain of causation, as established in *R v Kennedy (No 2)*, is a valuable and clear starting point for analysis. It correctly attributes responsibility to autonomous individuals for their own actions. However, to state that it *clearly* breaks the chain in all circumstances is an overstatement. The case law demonstrates that the courts have carved out significant exceptions and qualifications. In victim escape cases, the concept of foreseeability complicates the notion of a ‘voluntary’ act. With the thin skull rule, as seen in *Blaue*, a clear policy consideration overrides the principle entirely. Similarly, when assessing third-party interventions, such as police conduct in *Pagett* or medical negligence in *Cheshire*, the courts focus on whether the act was a foreseeable response to the defendant’s wrongdoing, rather than whether it was technically free and voluntary. Therefore, while the ‘free, voluntary, and informed’ test is a core part of the law on causation, its application is far from clear and is often adapted to achieve what the judiciary considers a just result.
## References
*R v Blaue* [1975] 1 WLR 1411
*R v Cheshire* [1991] 1 WLR 844
*R v Jordan* (1956) 40 Cr App R 152
*R v Kennedy (No 2)* [2007] UKHL 38
*R v Pagett* (1983) 76 Cr App R 279
*R v Roberts* (1971) 56 Cr App R 95
*R v White* [1910] 2 KB 124
*R v Williams and Davis* [1992] 1 WLR 380
