Joint possession of drugs does not require proof of 'acting in concert' as a separate element; the critical feature is shared control, not an antecedent agreement. Trial judges directing on joint possession should explain the concept in terms of shared possessory rights or joint control, and should avoid conflating joint possession with joint intention to sell, given the different burdens of proof on those issues. The regulations prescribing 2 grams as the trafficable quantity for mixtures containing heroin or methylamphetamine under the Controlled Substances (General) Regulations 2000 (SA) are valid.
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