Fagan v Metropolitan Police Commissioner [1969] 1 QB 439, [1968] 3 W.L.R. 1120
Facts
A police officer directed Fagan to move his car. In manoeuvring, Fagan drove onto the officer's foot. The initial contact was treated as accidental. Once told what had happened, however, he refused to move the car promptly and left it pressing on the foot. He was convicted of assaulting the officer. On appeal, he argued that the original act lacked the necessary mental element and that his later refusal to act could not supply a new assault. The court considered whether the physical interference was continuing.
Legal Issue
Could the necessary mens rea arise after the accidental initial contact while the car remained on the officer's foot as a continuing act?
Held
The Divisional Court upheld the conviction by treating the car's continued presence on the officer's foot as a continuing act. Although the initial contact was accidental, the unlawful force was still being applied when Fagan became aware of it and deliberately refused to remove the car. Actus reus and mens rea therefore coincided during that continuing interference.
The reasoning did not make a completed innocent act retrospectively criminal whenever a bad intention later arose. Nor did it establish that every refusal to act amounts to an assault. It depended on the continuing application of force and the defendant's mental state while that act was still occurring.
⭐ Legal Principle
Actus reus and mens rea can coincide during a continuing act even if the act began innocently. Fagan became liable when he knowingly continued the physical interference. A later guilty thought cannot, by itself, retrospectively convert an entirely completed innocent act into an offence.
Significance
Fagan gives a practical illustration of the coincidence requirement in criminal liability. It also explains why identifying the duration of the act matters before classifying later conduct as a mere omission. Students should specify what continued physically and when the defendant acquired the relevant mental state. The case does not dispense with concurrence; it locates concurrence within an ongoing application of force rather than only at the first contact.
Common exam questions about this case
When did the act and mental element coincide?
They coincided after Fagan knew the car was on the officer's foot and deliberately left it there. The physical interference had not ended. Treating that interference as a continuing act allowed the court to identify a period when both elements existed, despite the accidental beginning.
Why was the refusal not treated simply as an omission?
The majority viewed the force exerted through the car as continuing throughout the encounter. Fagan was not merely failing to reverse a wholly completed event. That description of the act was essential to the result and should not be replaced by a general assertion that all failures to move are assaults.
Does later mens rea make an earlier completed accident criminal?
Not automatically. Fagan depended on an act still continuing when the mental element arose. If the innocent act were wholly over before any relevant intention or recklessness developed, the case would not itself establish concurrence. Students must analyse the actual sequence rather than infer retrospective liability from later hostility.