To establish that a person 'caused' another to take a poison under s 39 of the Crimes Act 1900 (NSW), the Crown must prove the accused was in a position of influence over the other person such that the taking was the consequence of the accused exerting some capacity to control or influence the other's acts; merely encouraging, influencing, or making drugs available is insufficient. Where the recipient made a voluntary and informed decision to take the drug, the chain of causation is broken. A 'fully informed' person is one who has been given the knowledge the supplier possesses about the drug's properties and dangers, not all knowledge available in the community.
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