Where the amount of pure drug within a mixture is known, a sentencing judge may legitimately assess the gravity of drug trafficking by comparing the pure drug amount to the commercial quantity threshold for the pure drug, rather than being confined to the mixture threshold. The totality principle as stated in Bowen requires the sentencing court to consider the combined effect of the original sentence and the proposed sentence, not merely the additional period to be served by reason of parole cancellation. A post-sentence Parole Board determination confirming what the sentencing judge had already treated as 'highly probable' does not constitute admissible fresh evidence.
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