"Yet somehow, it's caught up in a completely unrelated drug war that prevents American farmers from growing this crop and forces us to import it from other countries," Polis said Wednesday. "Our institutions of higher education can't even grow or cultivate hemp for research purposes."

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Polis said his amendment would only take effect in states that have authorized hemp cultivation, and stressed that "hemp is not marijuana."

An opponent of his language, Rep. Steve King (R-Iowa), said hemp production has been limited because it is difficult to distinguish it from the marijuana plant. "Even though the gentleman says hemp is not marijuana, I don't know if one can tell the difference when it's planted row by row out in the field," King said.

Late Wednesday, House Agriculture Committee ranking member Collin Peterson (D-Minn.) said there has been some success splicing a gene into hemp plants that allow them to emit a fluorescent glow, making it easier to differentiate between it and marijuana.

"So now the hemp that grows is fluorescent, and so you can clearly tell the difference between the hemp and the marijuana," Peterson said. "So we have solved that problem through research."

The House approved the amendment from Polis and Reps. Earl BlumenauerEarl BlumenauerGOP chairman breaks with Trump on elephant trophy imports Live coverage: Day four of the Ways and Means GOP tax bill markup Live coverage: Day two of the Ways and Means GOP tax bill markup MORE (D-Ore.) and Tom Massie (R-Ky.) in a 225-200 vote. More than 60 Republicans supported it.

The proposal was one of several that the House considered in Thursday morning roll-call votes, from:

Mo BrooksMorris (Mo) Jackson BrooksGOP rep rushes down stairs as reporter asks about Roy Moore's accusers GOP lawmaker backing Moore: Conservative agenda 'more important than contested sexual allegations’ Alabama rep: I'm still backing Moore because he'll 'vote right' MORE (R-Ala.), to terminate funding for the USDA's Emerging Markets Program after Sept. 30, 2013, saving $10 million per year. Failed, 103-322.

G.K. ButterfieldGeorge (G.K.) Kenneth ButterfieldBlack lawmakers give tech sector low marks amid Silicon Valley trip Week ahead in tech: Black Caucus takes diversity push to Silicon Valley Overnight Tech: Black lawmakers press Sandberg on diversity at Facebook | Dems want hearing on Trump tweets about media | Watchdog to probe alleged FCC cyberattack MORE (D-N.C.), allowing people to buy personal hygiene items using SNAP benefits. Failed, 123-297.

— Tom Marino (R-Pa.), establishing a pilot program in nine states in which the Government Accountability Office can collect data on how food stamps are being used. Failed, 79-346

David SchweikertDavid SchweikertThe Hill's Whip List: Where Republicans stand on tax-reform bill GOP Senate hopeful Kelli Ward leads challengers in internal poll Kelli Ward pursues Rand Paul’s endorsement in Arizona MORE (R-Ariz.), eliminating the Healthy Food Financing Initiative. Failed, 194-232.

— John Tierney (D-Mass.), allowing commercial fishermen to receive Emergency Disaster Loan funds. Failed, 211-215.