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A federal law illegalizing marijuana -- the Marijuana Tax Act -- was passed in 1937. However, many states, such as Iowa, Texas, Nebraska, Washington, Oregon, Arkansas, Wyoming, and Nevada, had already passed state laws illegalizing marijuana in the 1920s.

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Q: When did marijuana become illegal in the United states?
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What states in the United States of America still consider marijuana illegal?

In four states — Idaho, Kansas, South Carolina and Wyoming — marijuana is fully illegal, according to DISA Global Solutions, a drug testing company.


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