Retrospective punishment change barred, while pure opium is assessed by the recovered substance itself under NDPS law.

A later notification enlarging punishment by treating the whole mixture or solution as the relevant quantity could not be applied retrospectively, because it would impose a heavier penal consequence on pre-notification conduct. For pure opium, the decisive factor under the NDPS Act was the recovered substance itself, not the morphine percentage. The statutory entry specific to opium applied to the entire recovered contraband, while provisions concerning mixtures or derivatives were distinguished. On that basis, the morphine content was held irrelevant for liability and sentence, and the conviction and sentence were sustained.

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Issues: (i) Whether the notification dated 18.11.2009, which directs that quantity for punishment purposes be determined by the entire mixture or solution, could be applied retrospectively to the appellant's case. (ii) Whether, in respect of opium recovered in its pure form, the quantity of morphine content or the total quantity of the recovered substance is relevant for deciding liability and sentence under the NDPS Act.

Issue (i): Whether the notification dated 18.11.2009, which directs that quantity for punishment purposes be determined by the entire mixture or solution, could be applied retrospectively to the appellant's case.

Analysis: The notification enlarged the basis for determining punishable quantity by treating the whole mixture or solution as relevant for sentencing. Such a change affects the penal consequences of the offence and therefore cannot be applied to transactions that occurred before its issuance. A penal provision or amendment that enhances punishment does not operate retrospectively, and applying it to the present case would offend the constitutional prohibition against ex post facto penal burden.

Conclusion: The notification dated 18.11.2009 was held to be inapplicable retrospectively and could not govern the appellant's case.

Issue (ii): Whether, in respect of opium recovered in its pure form, the quantity of morphine content or the total quantity of the recovered substance is relevant for deciding liability and sentence under the NDPS Act.

Analysis: The recovered substance was opium itself and not a mixed preparation. Under the statutory definition, pure opium falls within clause (a) of the definition of opium, while clause (b) applies only to a mixture with or without neutral material. For pure opium, the presence or percentage of morphine is not the decisive factor for classification or punishment. The relevant entry is the one dealing specifically with opium, and the entire recovered quantity is to be considered under that entry rather than reducing the substance to its morphine content. The authorities dealing with heroin or opium derivatives were distinguished on that basis.

Conclusion: The entire recovered substance was rightly treated as opium, the morphine percentage was irrelevant, and the conviction and sentence were sustained.

Final Conclusion: The appeal failed on merits because the recovered contraband was pure opium, the later notification could not be applied retroactively, and the conviction under the NDPS Act remained undisturbed.

Ratio Decidendi: Where the contraband is pure opium and not a mixture, punishment is governed by the specific opium entry and not by morphine content, and a later notification enlarging sentencing consequences cannot be applied retrospectively.

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