According to R v. Kennedy, under what condition is a supplier of drugs not liable for manslaughter?

In R v. Kennedy, the court established that a supplier of drugs may not be held liable for manslaughter if the adult receiver of the drug is fully informed and acts responsibly in self-administering the substance. The key element in this context is the notion of informed choice and personal autonomy.

When an adult is fully informed about the nature and potential risks of the drug, and they choose to take it of their own volition, this indicates an exercise of personal responsibility. The law recognizes that individuals have the capacity to make choices regarding their own health and well-being, and when an informed adult decides to consume drugs, the supplier's liability for the subsequent consequences of that choice is diminished.

This principle hinges on the understanding that, in the act of self-administration, the individual assumes full responsibility for their actions. Hence, if they are aware of what they are doing and choose to proceed, they are viewed as the primary actor in the scenario, which can negate the supplier's liability for any unfortunate outcomes that result from the self-administration of the drugs.