A Level Law Practice Exam 2025 – 400 Free Practice Questions to Pass the Exam

M'Naughten’s definition, stemming from the M'Naughten Rules established in 1843, primarily addresses the mental state of a defendant at the time of the crime. It specifically emphasizes the concept of a "defect of reason," which relates to the individual's inability to understand the nature and quality of their actions, or to know that what they were doing was wrong due to a severe mental disorder.

This understanding is critical within the legal context, as it establishes the basis for the insanity defense. When individuals are unable to comprehend their actions because of their mental illness, they may not possess the requisite mens rea, or guilty mind, necessary to be held accountable for their conduct. Thus, the focus on the lack of understanding and the defect of reason is key to determining whether a defendant can be deemed responsible for a criminal act.

While aspects like personal history of mental illness and defined criteria for sanity may play roles in broader contexts of legal assessments, they do not capture the core essence of the M'Naughten definition, which is fundamentally about the cognitive and psychological impairment as it relates directly to the perceived morality and awareness of the act committed.