"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 BlumenauerOvernight Finance: Biz groups endorse Trump's Labor pick | New CBO score coming before health bill vote | Lawmakers push back on public broadcasting cuts Dem, GOP lawmakers push back against Trump’s cuts to public broadcasting Trump: Mar-a-Lago 'most convenient' place to hold VA meeting 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 BrooksMo BrooksTrump, GOP fumble chance to govern GOP rep: Health bill ‘one of the worst’ I’ve seen House votes to begin debate on healthcare bill; six Republicans defect 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. ButterfieldG.K. ButterfieldFCC defends not fighting legal challenge to prison call rates A guide to the committees: House 40 House Dems to urge Trump to suspend Flynn 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 SchweikertHealthcare fight pits Trump against Club for Growth GOP leaders seek healthcare votes from competing factions Trump, GOP struggle to find healthcare votes 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.