Confirms that the Crown cannot satisfy its onus under s 4(3) of the Forensic Provisions Act merely by showing drug ingestion was the only conclusively identified cause of psychosis; internal vulnerabilities (genetic predisposition, brain injury, chronic substance exposure) need not be conclusively proven as operative causes to defeat the carve-out. the distinction between knowing an act is illegal and knowing it is wrong under s 28(1)(b) remains critical, and post-offence conduct suggesting awareness of criminal liability does not necessarily establish capacity to reason about moral wrongfulness.
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