What must the prosecution prove to establish criminal liability?
Actus reus and mens rea: conduct, consequence and circumstance, omissions, causation, intention and recklessness, transferred malice, and the coincidence of actus reus and mens rea.
A focused answer to the AQA A-Level Law actus reus and mens rea topic, covering conduct and consequence crimes, liability for omissions, factual and legal causation, intention and recklessness, transferred malice and the coincidence rule.
Reviewed by: AI editorial process; not yet individually human-reviewed
Have a quick question? Jump to the Q&A page
Jump to a section
What this dot point is asking
AQA wants you to explain the two elements of criminal liability, deal with liability for omissions and the rules of causation, define intention and recklessness, and apply transferred malice and the coincidence rule. These principles run through every offence in the module.
Actus reus and omissions
The actus reus takes one of three forms. Conduct crimes punish the act itself regardless of result (perjury, dangerous driving). Consequence (result) crimes require the conduct to produce a particular outcome, which brings in causation (murder requires a death). Circumstance (state of affairs) crimes punish a situation rather than any positive act, and these can be strikingly harsh: in R v Larsonneur the defendant was convicted of being an illegal alien "found" in the UK even though she had been brought there forcibly, and in Winzar v Chief Constable of Kent a drunk man removed by police to the highway was guilty of being drunk on a highway. These illustrate that the actus reus need not always be willed conduct.
The act must also be voluntary: a reflex, spasm or movement during unconsciousness is not an act for which the law holds a person responsible (Hill v Baxter, illustrated by the swarm-of-bees example).
Duties to act recognised by the law include a duty arising from a contract (R v Pittwood, the level-crossing keeper), a special relationship (R v Gibbins and Proctor, parent and starving child), a voluntarily assumed duty (R v Stone and Dobinson, taking in a frail relative), a public office (R v Dytham, the police officer who failed to intervene), and a duty to avert a dangerous situation the defendant created (R v Miller, the squatter who set a mattress alight and did nothing). English law famously imposes no general "good Samaritan" duty to rescue a stranger, so the duty must be located in one of these categories before an omission can found liability.
Causation
Mens rea
- Intention can be direct (it is the defendant's aim or purpose) or oblique (the consequence was a virtual certainty and the defendant appreciated this, R v Woollin).
- Recklessness is subjective: the defendant foresaw a risk and went on unjustifiably to take it (R v Cunningham, confirmed for criminal damage in R v G, overruling Caldwell).
- Negligence (a failure to meet the standard of the reasonable person) is the fault element of gross negligence manslaughter.
Transferred malice and coincidence
Transferred malice allows the mens rea aimed at one victim or object to transfer to the actual victim, provided the crime is of the same type (R v Latimer, where a blow aimed with a belt struck a bystander). It does not transfer between different types of offence: in R v Pembliton an intention to hit people with a stone could not be transferred to the breaking of a window, because property and personal offences are different in kind.
The actus reus and mens rea must coincide in time. The courts avoid technical acquittals through two devices. The continuing act doctrine treats an ongoing actus reus as still in progress when the mens rea forms: in Fagan v MPC the defendant accidentally drove onto a policeman's foot (actus reus) and then formed the intention to stay there, so the battery continued until he removed the car. The single transaction doctrine treats a connected series of acts as one: in Thabo Meli v R the defendants beat the victim intending to kill, wrongly believed him dead, and rolled him off a cliff where he actually died of exposure; the whole episode was one transaction, so liability for murder stood (applied again in R v Church).
Why these principles run through the module
Actus reus and mens rea are the analytical spine of every offence in the criminal module. In a problem question you must isolate the actus reus, prove causation for any result crime, then match the required mens rea before considering defences. Examiners reward candidates who keep the two elements separate, cite the correct authority for each, and apply the coincidence and transferred-malice rules only where the facts call for them rather than reciting them mechanically.
Exam-style practice questions
Practice questions written in the style of AQA exam questions on this dot point, with worked answer explainers. The year tag is the paper they imitate, not the source.
AQA 201910 marksTom pushes Vince during an argument. Vince stumbles into the road and is struck and killed by a speeding car. Explain whether Tom can be said to have caused Vince's death, applying the rules on factual and legal causation. [10 marks]Show worked answer →
AQA Paper 1 application questions reward a clear AO1 statement of the law followed by AO2 application to the named facts.
Factual causation: apply the "but for" test from R v White. But for Tom's push, would Vince have been on the road and struck? If not, factual causation is made out.
Legal causation: Tom's act must be a more than minimal (operating and substantial) cause (R v Smith). Then ask whether the speeding car was a free, deliberate and informed intervening act breaking the chain. A negligent or instinctive third-party act usually does not break the chain where the original danger is still operating; only a truly extraordinary or voluntary intervention does (R v Cheshire, R v Pagett).
Conclude on the facts: the push created the danger that put Vince in the road, so the chain is likely intact. Markers reward the named tests, correct cases applied to Tom and Vince, and a reasoned conclusion rather than a bare assertion.
AQA 20214 marksExplain the meaning of oblique intention and how it differs from recklessness. [4 marks]Show worked answer →
A 4-mark Explain question wants accurate AO1 with authority. Oblique (indirect) intention applies where the consequence was not the defendant's aim but was a virtual certainty of their actions, and the defendant appreciated that it was virtually certain (R v Woollin). The jury may then find (not must find) intention.
Recklessness is subjective: the defendant foresaw a risk of the consequence and went on unjustifiably to take it (R v Cunningham, R v G). The key distinction markers reward is the degree of foresight: virtual certainty for oblique intention against foresight of a mere risk for recklessness, and that Woollin permits but does not compel the inference of intention.
Related dot points
- Rules and theory of criminal law: the purposes of criminal law, the relationship between criminal law and morality and justice, fault, and the harm principle.
A focused answer to the AQA A-Level Law rules and theory of criminal law topic, covering the purposes of criminal law, the relationship between criminal law and morality and justice, the concept of fault, and the harm principle.
- Non-fatal offences against the person: assault, battery, assault occasioning actual bodily harm, and malicious wounding or inflicting grievous bodily harm under sections 47, 20 and 18.
A focused answer to the AQA A-Level Law non-fatal offences topic, covering assault and battery, section 47 ABH, section 20 malicious wounding and inflicting GBH, and section 18 wounding with intent, with the actus reus and mens rea of each.
- Fatal offences: the actus reus and mens rea of murder, the partial defences of loss of control and diminished responsibility, and voluntary and involuntary manslaughter.
A focused answer to the AQA A-Level Law fatal offences topic, covering the actus reus and mens rea of murder, the partial defences of loss of control and diminished responsibility, and unlawful act and gross negligence manslaughter.
- Property offences: the elements of theft under the Theft Act 1968 (appropriation, property, belonging to another, dishonesty and intention to permanently deprive) and robbery.
A focused answer to the AQA A-Level Law property offences topic, covering the five elements of theft under the Theft Act 1968 (appropriation, property, belonging to another, dishonesty and intention to permanently deprive) and the offence of robbery.
- General defences in criminal law: insanity, automatism, intoxication, self-defence and prevention of crime, consent, duress and necessity.
A focused answer to the AQA A-Level Law criminal defences topic, covering insanity, automatism, intoxication, self-defence and prevention of crime, consent and duress, with the leading authorities for each.
Sources & how we know this
- AQA A-level Law (7162) specification — AQA (2017)