There is no legal rule requiring the prosecution to negative possession by all persons who may have had access to a concealed drug. The cases of Filippetti and Lai were decided on their facts — the convictions were quashed because there was a reasonable hypothesis consistent with innocence that had not been negatived, not because of any legal obligation to call evidence from all potential possessors. The question remains one of fact: whether there is a reasonable hypothesis consistent with innocence and whether it has been excluded.
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2 of the 6 citing cases carry a classified treatment. How each court treated it is available to signed-in members.