Why don’t most conservatives apply the same logic to drugs that they use for guns? It can’t be because there is no amendment in the U.S. Constitution that specifies a right to ingest the substance of one’s choice. For one thing, there is an impeccable constitutional case against national drug prohibition, one which an older generation of conservatives understood better. That case begins by noting that, as the Constitution is constructed, the federal government may exercise only the powers expressly delegated in Article I, Section 8.

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