Coincidence of Actus Reus and Mens Rea (AQA A-Level Law): Revision Notes
Coincidence of actus reus and mens rea
What is the contemporaneity rule?
In criminal law, there is a fundamental principle known as the contemporaneity rule. This principle requires that the actus reus (guilty act) and mens rea (guilty mind) must exist at the same moment in time. The term "contemporaneity" means "at the same time", establishing that a defendant can only be convicted if both elements of the crime occur simultaneously.
This general rule exists because it would be unjust to convict someone of a crime if they possessed the guilty mind at one point, but committed the guilty act at a completely different time when they lacked the necessary mental state.
Worked Example: The Timing Problem
If X forms an intention to kill Y on Monday, but only accidentally causes Y's death on Friday (without any murderous intent at that time), X cannot be convicted of murder. The mens rea (intention to kill) did not coincide with the actus reus (the killing).
Judicial flexibility and the interests of justice
While the contemporaneity rule appears strict, judges have shown themselves to be flexible with this requirement. This flexibility exists to ensure that defendants who clearly deserve conviction are not able to escape liability on technical grounds.
The courts have developed two main approaches to avoid injustice where there appears to be a temporal gap between actus reus and mens rea:
- The continuing act approach
- The single transaction approach
Both approaches achieve the same result: they allow courts to find that actus reus and mens rea did in fact coincide, even when they appear not to have done so at first glance.
Key cases demonstrating judicial flexibility
Fagan v MPC (1969) - the continuing act approach
Facts: The defendant accidentally drove his car onto a police officer's foot. When the officer shouted at him to move the vehicle, the defendant refused to do so, keeping the car on the officer's foot.
Legal issue: The defendant argued there was no coincidence because:
- When he drove onto the foot (actus reus), it was accidental, so no mens rea existed
- When he formed the intention to hurt the officer (mens rea), the actus reus was already complete
Decision: The court held that driving onto the foot and then remaining there constituted a continuing act. The actus reus was not just the initial driving onto the foot, but the entire period during which the car remained there. When the defendant refused to move (forming mens rea), the actus reus was still continuing, so they coincided.
Legal principle: Where an actus reus is ongoing rather than instantaneous, mens rea need only be formed at some point whilst the actus reus continues.
Thabo-Meli v R (1954) - the single transaction approach
Facts: The defendants formed a plan to kill a man. They beat him over the head intending to kill him, then (believing him to be dead) threw his body over a cliff to make it look like an accident. Medical evidence revealed the victim was still alive after the beating and actually died from exposure at the bottom of the cliff.
Legal issue: The defendants argued there was no coincidence because:
- When they formed the intention to kill and beat him (mens rea), he was still alive, so no actus reus of murder occurred
- When they threw him off the cliff (actus reus of murder - the actual killing), they believed he was already dead, so they lacked mens rea (you cannot intend to kill someone you believe is already deceased)
Decision: The court held that the entire sequence of events - the beating and the throwing over the cliff - constituted one continuing act or single transaction. The mens rea formed at the beginning of this transaction was sufficient to cover the entire sequence.
Legal principle: Where a defendant embarks on a series of acts designed to achieve a single criminal objective, the courts may treat these acts as a single transaction. Mens rea formed at any point during this transaction will suffice.
R v Church (1965) - application of the single transaction approach
Facts: During a fight, the appellant knocked the victim unconscious. He attempted to revive her for approximately 30 minutes but was unsuccessful. Believing she was dead, he threw her body into a river to dispose of it. Medical evidence later showed that she was still alive when thrown into the river and that drowning was the actual cause of death.
Legal issue: Similar to Thabo-Meli, there appeared to be a gap:
- During the fight (when he had mens rea), she was still alive
- When he threw her in the river (the actus reus that killed her), he believed she was dead
Decision: The court applied the single transaction approach. The act of beating her and throwing her in the river was treated as one continuing act. The entire sequence formed a single transaction, so the mens rea from the initial assault was sufficient.
Legal principle: This case confirmed the approach in Thabo-Meli and established that the single transaction principle applies even where there is a significant time gap between the initial act (with mens rea) and the final act that causes death.
Distinguishing between the two approaches
Both the continuing act approach (Fagan) and the single transaction approach (Thabo-Meli and Church) achieve similar results, but they operate slightly differently:
Continuing act approach:
- The actus reus itself is viewed as ongoing
- Mens rea can be formed at any point while the actus reus continues
- Typically applies where the defendant has control over an ongoing situation
Single transaction approach:
- A series of connected acts are viewed as one continuous event
- Mens rea at the beginning covers the entire sequence
- Typically applies where the defendant has formed a plan involving multiple steps
In practice, courts may use either approach depending on which fits the facts better, and sometimes the distinction is not clearly drawn.
Why this rule matters
The flexibility shown by judges in applying the contemporaneity rule serves important purposes:
- Preventing technical acquittals: Without this flexibility, clearly guilty defendants could escape conviction on technicalities
- Reflecting reality: Criminal conduct often unfolds over time rather than in a single instant
- Achieving justice: The approaches ensure that defendants who clearly possess both actus reus and mens rea cannot avoid liability simply because of the sequence of events
However, this flexibility must be balanced against legal certainty and the need for clear rules that defendants can understand.
Exam application
This content is assessed in Paper 1 (Criminal law).
When answering problem questions involving contemporaneity issues:
- State the general rule: Begin by explaining that actus reus and mens rea must normally coincide
- Identify the apparent problem: Explain why the facts suggest a lack of coincidence
- Apply the relevant approach: Consider whether the continuing act or single transaction approach applies
- Use case authority: Reference Fagan, Thabo-Meli, or Church as appropriate
- Reach a conclusion: Explain whether the court is likely to find coincidence
Example structure for an essay question:
- Define the contemporaneity rule and its rationale
- Explain why judicial flexibility is necessary (interests of justice)
- Analyse Fagan and the continuing act approach
- Analyse Thabo-Meli and Church and the single transaction approach
- Evaluate whether the current approach strikes the right balance between flexibility and legal certainty
Summary box
Key points to remember:
- The contemporaneity rule requires actus reus and mens rea to occur at the same time
- Judges have shown flexibility in applying this rule to avoid unjust acquittals
- The continuing act approach (Fagan v MPC) treats the actus reus as ongoing, so mens rea can be formed at any point during its continuation
- The single transaction approach (Thabo-Meli v R, R v Church) treats a series of connected acts as one event, with mens rea at the start covering the whole sequence
- Both approaches serve the interests of justice by ensuring deserving defendants cannot escape conviction on technicalities
Key cases
| Case | Approach | Key principle |
|---|---|---|
| Fagan v MPC (1969) | Continuing act | Driving onto foot and remaining there was one continuing act |
| Thabo-Meli v R (1954) | Single transaction | Beating victim and throwing him over cliff was one transaction |
| R v Church (1965) | Single transaction | Beating victim and throwing her in river was one transaction |
Critical legal principles
- Contemporaneity: Actus reus and mens rea must normally coincide in time
- Continuing act: An actus reus that persists over time, during which mens rea can be formed
- Single transaction: A series of acts forming one continuous criminal enterprise
- Interests of justice: The rationale for judicial flexibility in applying the strict rule