LEGAL PRINCIPLE: CRIMINAL LAW — Defences — Insanity — Relevant Circumstances
PRINCIPLE STATEMENT
In insanity cases, the judge must consider the behaviour of the accused at the time of the killing as well as after the killing.
RATIO DECIDENDI (SOURCE)
Per Katsina-Alu, JSC, in Ani v. State (2002) NLC-3152001(SC) at p. 5; Paras D–E.
"In insanity cases, the Judge must consider the behaviour of the accused at the time of the killing as well as after the killing. See Kure v. The State (1988) 1 NWLR (Pt. 71) 404; Ishola Karimu v. The State (1989) 1 NWLR (pt.96) 124 SC; (1989) 1 SC 121 at 134."
EXPLANATION / SCOPE
The court must examine the accused’s behaviour both before, during, and after the killing. Post-offence conduct may indicate mental state. The principle applies to all insanity defences. The court considers the totality of the circumstances. Medical evidence is important but not conclusive. The judge must evaluate the accused’s actions and statements. The rule ensures a comprehensive assessment. The accused’s behaviour after the incident may show awareness of wrongfulness. The court may consider whether the accused fled, hid, or expressed remorse. The principle prevents a narrow focus on the moment of the offence.