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R v Sullivan. 1984;

Driver cleared by reason of insanity over death of Louis Thorold available on the Ely Standard Website. 2022.

Insanity as a defence to a criminal charge

24 November 2022
Volume 31 · Issue 21


Richard Griffith, Senior Lecturer in Health Law at Swansea University, considers the availability of the special verdict and common law insanity defence in cases where a person with a mental disorder faces a criminal charge

The question of whether people with mental disorder should be held accountable for the offences they commit has been an issue that has vexed politicians and public opinion since M'Naughten's Case (1843). Much of the legal terminology relating to the trial and defences that concern perpetrators who have mental disorders hail from the 19th century and continue to apply today.

The debate as to whether people with a mental disorder who commit offences should be punished was again raised when a woman in her mid-seventies who was charged with causing death by careless driving was found not guilty of the offence by reason of insanity. The woman, who had an undiagnosed dementia at the time of the offence, turned her car into the path of a van and the collision forced the van into a woman and child on the pavement. The jury accepted that, as a result of the dementia, the driver did not what she was doing and that it was more than a momentary lapse of concentration. As a result of the special verdict, the judge imposed a 12-month supervision order on the driver (Woodcock, 2022).

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