"It's analogous to law enforcement going after the drug dealers, but not necessarily after the users, " he says.

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Louisiana passed a similar law last year, and analogous bills have been proposed in Oregon and several other states as well.

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Alderman challenged the constitutionality of the law, since it criminalized his possession of an item within a single state where it was legal, but the Ninth Circuit rejected that challenge, citing a seemingly analogous 1977 Supreme Court decision called Scarborough upholding a federal law banning felons from owning handguns.

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