"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 BlumenauerClinton advises checking your voter registration during Trump's State of the Union Ocasio-Cortez, Pressley to boycott State of the Union 10 Democrats to boycott Trump State of the Union address 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 BrooksRepublican group asks 'what is Trump hiding' in Times Square billboard Conservative group hits White House with billboard ads: 'What is Trump hiding?' Trump takes pulse of GOP on Alabama Senate race 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 ButterfieldHouse poised to hand impeachment articles to Senate Democrat makes case for impeachment in Spanish during House floor debate Democrats likely to gain seats under new North Carolina maps 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 SchweikertOvernight Health Care — Presented by Partnership for America's Health Care Future — Democrats seek to preempt Trump message on health care | E-cigarette executives set for grilling | Dems urge emergency funding for coronavirus Democrats slam GOP on drug prices in bilingual digital ads Overnight Defense: House passes bills to rein in Trump on Iran | Pentagon seeks Iraq's permission to deploy missile defenses | Roberts refuses to read Paul question on whistleblower during impeachment trial 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.