Actus Reus: Causation (Copy)

2.1.1 Actus Reus — Causation

Overview and structure

• Causation is required for consequence crimes: the prosecution must prove that the defendant’s conduct factually and legally caused the prohibited result (e.g., death, injury).
• Two linked questions:
  • Factual causation: Did the result occur but for the defendant’s conduct?
  • Legal causation: Is the defendant’s conduct an operating and substantial cause of the result, with no novus actus interveniens (intervening act) breaking the chain?
• Policy anchors:
  • Liability should reflect fault and fairness (Article 6 ECHR fair trial values).
  • The law balances holding wrongdoers to account against not overextending criminal responsibility to remote, trivial, or superseded causes.

Factual causation — the “but for” test

• Test: Would the prohibited result have happened but for the defendant’s conduct?
• Key authorities and illustrations:
  • R v White [1910] 2 KB 124
    • D put poison in his mother’s drink intending to kill; she died of a heart attack before drinking it.
    • No factual causation for murder (death would have occurred anyway), but D guilty of attempted murder.
  • R v Pagett (1983) 76 Cr App R 279
    • D used partner as a human shield while firing at police; police returned fire and killed her.
    • “But for” D’s conduct, she would not have died; factual causation established.
  • R v Hughes [2013] UKSC 56
    • D, uninsured and driving faultlessly, collided with a drug‑impaired driver who died.
    • Supreme Court: mere “but for” presence is insufficient; requires a more than minimal causal contribution (bridges to legal causation).
  • R v Dyson (1908) 2 KB 454
    • Acceleration principle: If D accelerates V’s death (even if V was dying), D factually causes death.

Legal causation — substantial, operating cause and de minimis

• Even if the “but for” test is satisfied, the conduct must be a cause that is more than de minimis (i.e., not trivial), and remain an operating cause at time of death/injury.
• Core authorities:
  • R v Smith [1959] 2 QB 35
    • Soldier stabbed; dropped twice en route to treatment; poor medical care.
    • Original wound remained an operating and substantial cause of death; chain unbroken.
  • R v Cheshire [1991] 1 WLR 844
    • Medical negligence will only break chain if it is “so independent” and “so potent” as to render the defendant’s contribution insignificant.
    • Ordinary, even negligent medical treatment usually does not break the chain.
  • R v Jordan (1956) 40 Cr App R 152
    • Rare exception: treatment “palpably wrong” (e.g., allergic drug administered despite known allergy after wound had nearly healed) can break the chain.
  • R v Kimsey [1996] Crim LR 35
    • Jury direction: D’s driving need only be a cause that is more than a “slight or trifling” link to the death.
  • R v Hughes [2013] UKSC 56
    • Confirms that legal causation requires a non‑trivial, blameworthy causal contribution (mere presence insufficient for certain offences).

The thin skull rule (take the victim as you find them)

• Principle: D is liable for the full extent of harm even if V has an unusual vulnerability, belief, or condition that aggravates the result.
• Key authorities:
  • R v Blaue [1975] 1 WLR 1411
    • V, a Jehovah’s Witness, refused blood transfusion; she died from a stab wound.
    • Refusal does not break the chain; D must “take the victim as he finds her,” including physical and spiritual characteristics.
  • R v Hayward (1908) 21 Cox CC 692
    • Amiable for older statements of principle: the defendant remains liable where a pre‑existing condition contributes to death.
  • Scope:
    • Applies to physical fragility (e.g., haemophilia), psychological conditions, and belief‑based refusals of treatment.
• Rationale:
  • Avoids defendants escaping liability due to victim idiosyncrasies; focuses on D’s input into the prohibited harm.

Written and Compiled By Sir Hunain Zia, World Record Holder With 154 Total A Grades, 7 Distinctions and 11 World Records For Educate A Change AS Level Law Full Scale Course

Intervening acts (novus actus interveniens)

• Concept: A new, independent act can break the chain if it is free, deliberate, and informed (or is so potent as to eclipse the defendant’s contribution).
• Categories:
  • Intervening third‑party acts (medical treatment, rescuers, attackers, police)
  • Victim’s own acts (escape, self‑harm, drug self‑administration)
  • Natural events (rare; usually require unforeseeable, overwhelming events)

Intervening third‑party acts — medical treatment

• General rule: Medical treatment, even if negligent, usually does not break the chain (Smith; Cheshire).
• Break only if “palpably wrong” and renders D’s contribution insignificant (Jordan).
• Illustrations:
  • R v Malcherek; R v Steel [1981] 1 WLR 690
    • Switching off life support after brain death does not break the chain; original injury remains the operating cause.
  • R v Cheshire [1991]
    • Even significant medical negligence (e.g., tracheotomy complications) seldom severs causation unless it overwhelmingly supersedes D’s act.
  • R v Gowans; R v Hill (2003) (CA)
    • Subsequent infection while V in coma attributable to initial attack: chain typically unbroken where the original assault creates the condition in which later complications occur.

Intervening third‑party acts — police or bystanders

• R v Pagett (1983)
  • Police returning fire was a foreseeable reaction to D’s use of a human shield; chain not broken by police shots.
• Principle:
  • Reasonable acts of third parties in self‑defence, lawful arrest, or rescue are usually foreseeable and do not break the chain.

Written and Compiled By Sir Hunain Zia, World Record Holder With 154 Total A Grades, 7 Distinctions and 11 World Records For Educate A Change AS Level Law Full Scale Course

Victim’s own acts — escape or reaction to threat

• Test: Was V’s response reasonably foreseeable and not so “daft” as to be unforeseeable? (Roberts “daftness” test)
• Illustrations:
  • R v Roberts (1971) 56 Cr App R 95
    • V jumped from moving car to escape sexual advances; injuries foreseeable; chain intact.
  • R v Williams & Davis (1992) 95 Cr App R 1
    • Hitchhiker jumped from car after alleged robbery attempt; death found not reasonably foreseeable on facts; chain broken.
  • R v Majoram [2000] Crim LR 372
    • V jumped from window after group forced entry; flight was foreseeable; causation established.
• Takeaways:
  • The gravity of the threat, age/vulnerability of V, and speed of events influence foreseeability.
  • Sensible escape attempts keep the chain intact; wildly unexpected reactions can sever it.

Victim’s own acts — refusal of treatment and self‑harm

• Refusal of medical treatment (thin skull):
  • R v Blaue: refusal on religious grounds does not break the chain.
  • R v Holland (1841) 2 Mood & R 351: refusal of amputation did not absolve D; original wound remained cause.
• Self‑harm or suicide following the defendant’s conduct:
  • Complex and fact‑sensitive; courts consider whether the later act is truly free, deliberate, informed and independent of the defendant’s wrongdoing.
  • R v Dear [1996] Crim LR 595
    • V reopened his wounds (possibly intentionally); CA held D still liable where the original wounds were an operating and substantial cause.
  • R v Wallace [2018] EWCA Crim 690
    • Acid attack left V in extreme suffering; V travelled to Belgium for lawful euthanasia.
    • CA: jury was entitled to find D’s attack remained a significant and operative cause; the euthanasia decision did not automatically break the chain (fact‑sensitive).

Written and Compiled By Sir Hunain Zia, World Record Holder With 154 Total A Grades, 7 Distinctions and 11 World Records For Educate A Change AS Level Law Full Scale Course

Drugs cases — voluntary self‑administration

• Principle: A fully informed, voluntary act by the victim can be a novus actus breaking the chain.
• Authorities:
  • R v Kennedy (No 2) [2007] UKHL 38
    • D prepared heroin and gave it to V, who self‑injected and died.
    • HL: V’s free and informed decision to self‑inject broke the chain; D not guilty of unlawful act manslaughter.
  • R v Cato [1976] 1 WLR 110
    • D injected V directly with heroin; causation established; conviction for manslaughter upheld.
  • R v Evans (Gemma) [2009] 1 WLR 1999
    • D supplied heroin to her half‑sister, who self‑injected and showed overdose signs; D failed to seek help.
    • Gross negligence manslaughter: liability arises via omission after creating a dangerous situation (Miller principle), not via Kennedy’s supply rule.
• Distinctions to master:
  • Supply + self‑injection by V → chain broken (Kennedy).
  • D performs the injection → chain intact (Cato).
  • D supplies + then omits to act despite obvious peril → liability via gross negligence (Evans).

Natural events

• Rare in practice; the event must be extraordinary, unforeseeable, and overwhelming to break the chain (e.g., truly exceptional natural disaster).
• Where the defendant’s act places the victim in a position of danger, naturally arising complications (e.g., predictable infections, ordinary weather while injured) are usually foreseeable and keep the chain intact.

Written and Compiled By Sir Hunain Zia, World Record Holder With 154 Total A Grades, 7 Distinctions and 11 World Records For Educate A Change AS Level Law Full Scale Course

Omissions and the chain of causation

• Where liability is based on omission, causation asks whether the failure to act made a more than minimal contribution to the result.
• Anchors:
  • R v Miller [1983] 2 AC 161: creating a dangerous situation imposes a duty to act; failure to mitigate keeps causation with D.
  • DPP v Santana‑Bermudez [2003] EWHC 2908 (Admin): failure to warn officer about needles; omission causative of injury.
• Medical duty contexts:
  • Airedale NHS Trust v Bland [1993] AC 789: lawful withdrawal of life support where not in patient’s best interests does not absolve initial wrongdoer; it is characterised as an omission consistent with best‑interests decision‑making.

Multiple causes and concurrent contributions

• More than one person can causally contribute to the result; each may be liable if their contribution is more than de minimis.
• Cases:
  • R v Benge (1865) 4 F & F 504
    • Railway foreman negligently gave wrong time; others’ negligence also contributed.
    • D still liable: his negligence was a substantial cause.
  • R v Kimsey [1996]
    • Competing driving errors can both be causative if more than a “slight or trifling” link.
• Practical point:
  • Juries need not identify the sole cause; they decide whether D’s contribution was significant in law.

Year and a day rule — abolition and time‑limit safeguard

• Historic rule: No homicide charge if V died more than one year and one day after the injury.
• Abolished by the Law Reform (Year and a Day Rule) Act 1996.
• Safeguard now: If more than three years pass between injury and death, or D has already been convicted of an offence connected to the death, the prosecution for homicide ordinarily requires the Attorney General’s consent (s.2, 1996 Act).
• Rationale: Modern medicine can sustain life far longer; causation inquiries are now evidence‑driven rather than time‑barred.

Foreseeability and reasonableness — unifying ideas

• Courts use foreseeability to test whether an intervening act is truly independent:
  • Foreseeable reactions (police returning fire, victim fleeing) keep chain intact.
  • Free, deliberate, informed choices by adults (e.g., self‑injection) may sever the chain unless other duties arise.
• The de minimis principle filters remote or trivial contributions; the operating and substantial standard guards against causal dilution.

Exam‑ready comparisons and problem‑question strategy

• Structure your answer:
  • Identify result element (e.g., death).
  • Apply factual causation (“but for” → cite White, Pagett).
  • Apply legal causation:
    • Operating and substantial cause (Smith; Cheshire).
    • Consider intervening acts:
      • Medical (usually no break; Cheshire; rare Jordan).
      • Victim reaction (foreseeable? Roberts/Majoram vs Williams & Davis).
      • Self‑administration of drugs (Kennedy vs Cato/Evans).
    • Thin skull (Blaue).
  • Conclude on whether D’s contribution remains more than de minimis and operative.
• Red flags to discuss:
  • Where treatment is “palpably wrong” (facts similar to Jordan).
  • Where victim’s response appears highly unreasonable/daft.
  • Where an apparently free and informed decision intervenes (e.g., Kennedy), unless a duty arises (e.g., Evans).

Quick case map (by theme)

• Factual causation: White; Pagett; Dyson
• Legal causation tests: Smith; Cheshire; Kimsey; Hughes
• Medical treatment: Jordan (break); Cheshire (no break); Malcherek & Steel (life support)
• Victim reaction: Roberts (foreseeable); Williams & Davis (not foreseeable); Majoram (foreseeable flight)
• Thin skull: Blaue; Hayward; Holland
• Drugs: Kennedy (self‑injection break); Cato (D injects); Evans (omission duty after supply)
• Multiple causes: Benge; Kimsey
• Police/bystanders: Pagett
• Omissions creating danger: Miller; Santana‑Bermudez
• Timing: Law Reform (Year and a Day Rule) Act 1996 (AG’s consent after 3 years)

Written and Compiled By Sir Hunain Zia, World Record Holder With 154 Total A Grades, 7 Distinctions and 11 World Records For Educate A Change AS Level Law Full Scale Course

Critical evaluation points (for 10–15 mark essays)

• Clarity vs. fairness:
  • The Cheshire standard protects defendants from being scapegoated for extraordinary medical blunders, but keeps responsibility where initial harm remains significant.
• Consistency:
  • Tension between Jordan (rare break) and the general trend (Smith; Cheshire). Examiners expect you to explain why Jordan is exceptional.
• Autonomy and thin skull:
  • Blaue prioritises victim autonomy; D cannot rely on V’s beliefs or vulnerabilities as an escape. Some critics argue this is harsh; policy favours protecting personal integrity.
• Victim choice and responsibility:
  • Kennedy emphasises adult autonomy in drug cases; fairness suggests suppliers are not automatically liable for a user’s free, informed choice—unless a duty arises (Evans).
• Foreseeability as a control mechanism:
  • Reactivity of victims/police/bystanders is usually foreseeable; only extraordinary, unreasonable reactions break the chain.
• Modern medicine and timing:
  • Abolition of the year‑and‑a‑day rule fits advances in life‑sustaining care; causation now rests on expert evidence and the operating and substantial test, with AG‑consent safeguard.

Written and Compiled By Sir Hunain Zia, World Record Holder With 154 Total A Grades, 7 Distinctions and 11 World Records For Educate A Change AS Level Law Full Scale Course

Applied mini‑scenarios (with quick analysis hooks)

• Scenario 1: D stabs V; hospital misdiagnoses; V dies after allergic drug given despite notes.
  • Cite Smith; Cheshire; Jordan. Was treatment “palpably wrong” and independent? If yes, Jordan‑type break; if not, chain intact.
• Scenario 2: D threatens V; V jumps from moving car at moderate speed and suffers ABH.
  • Roberts: likely foreseeable; chain intact.
• Scenario 3: D supplies heroin; V self‑injects; D leaves V despite obvious overdose signs.
  • Kennedy breaks chain for unlawful act manslaughter; but Evans allows gross negligence manslaughter via omission after creating danger.
• Scenario 4: D slaps V with undiagnosed haemophilia; minor bruise leads to lethal bleed.
  • Blaue / thin skull: chain intact; full liability.
• Scenario 5: Two drivers’ dangerous driving; collision kills third party.
  • Kimsey; Benge: each driver can be a more than minimal cause; both liable.

Written and Compiled By Sir Hunain Zia, World Record Holder With 154 Total A Grades, 7 Distinctions and 11 World Records For Educate A Change AS Level Law Full Scale Course