= Solution
\b[<Suicide> is evidence of an act requiring investigation, not by itself a diagnosis of <mental disorder>.] The inquiry concerns the person's mental state before and at the act; it must not reason in a circle that self-destruction proves “insanity” because only an “insane” person would do it.
First establish that the death was intentional self-inflicted death rather than accident, another person's act or an undetermined event. Then reconstruct the preceding course from medical records, family and other witnesses, correspondence and changes in ordinary behaviour. Give greatest weight to independently observed facts recorded before the death, rather than reinterpret every eccentricity afterwards. A surviving person's current examination may help, but confusion from injury, drugs or the acute crisis must not automatically be projected backwards.
Seek sustained changes in mood, sleep, appetite, activity, reasoning and functioning. Persistent hopelessness, loss of pleasure, excessive guilt and withdrawal may indicate a <depressive disorder>; the strength of the inference lies in a coherent syndrome and its time course, not a single unhappy remark. Modern clinical descriptions include these features and <suicidal thoughts>, while emphasizing that individuals need not show every symptom.<Depression by the National Institute of Mental Health>[“Signs and symptoms”: persistent mood and functional changes, sleep, appetite, guilt and suicidal thinking]{ref}
Investigate <delusions>, <hallucinations>, confused thought and loss of contact with reality, asking whether they influenced the act. Also consider a period of extreme excitement, <delirium>, <dementia>, intoxication, withdrawal or another bodily illness. The relevant question is how observed symptoms affected this person's understanding and decisions. For example, an independently documented false belief of unavoidable persecution provides a different kind of evidence from an ordinary financial worry. Modern <psychosis> may occur in several illnesses or with drugs and sleep deprivation; it is not established simply by an unusual belief or behaviour.<Understanding Psychosis by the National Institute of Mental Health>[“Signs and symptoms” and “Causes”: delusions, hallucinations, behavioural changes and alternative causes]{ref}
The language of the 1866 paper should also be read historically. The eighth-edition encyclopedia classified “suicidal mania” among forms of “monomania” and discussed disturbed impulses even without a delusion. Those categories explain why an examiner might ask about <suicide> and “insanity”, but they are not interchangeable with modern diagnostic categories.<Mental Diseases in the eighth edition of Encyclopædia Britannica>[Classification table, Monomania, and discussion of altered impulses and conduct]{ref}
Neither elaborate planning nor concealment proves a sound mind: organized actions can occur during serious illness. Conversely, apparently impulsive conduct does not identify one particular illness. Financial trouble, pain, bereavement, humiliation and fear may help explain a crisis, but their presence neither proves nor excludes <mental disorder>. The modern public-health account recognizes both associations with <depression> and alcohol problems and suicides during acute crises.<Suicide by the World Health Organization>[“Who is at risk?”: mental disorders, previous attempts and crises associated with life stress]{ref}
A reasoned opinion therefore specifies the symptoms actually supported, their relation in time to the act, alternative explanations and remaining uncertainty. Clinical diagnosis, the capacity relevant to a particular decision, and a historical legal verdict are separate conclusions. There is no medical rule that every <suicide> demonstrates legal irresponsibility. This procedural question supplies no individual case history, so the complete answer is the method of assessment, not an invented verdict about a deceased person.
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