Where the Crown case in a drug trafficking prosecution depends on circumstantial evidence, the intermediate stages of the alleged criminal enterprise (receipt of precursor chemicals, manufacture, and supply) are not 'indispensable links in a chain' requiring independent proof beyond reasonable doubt, but rather form part of an accumulation of circumstances from which guilt may be inferred. A sentencing judge may have regard to the retail price of a drug as a measure of the significance of the trafficking enterprise to the wider community.
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