"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 BlumenauerDems push for tough GMO labeling rule 5 things members of Congress are doing over August recess Lawmakers target horse meat trade 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 touts endorsement of second-place finisher in Alabama primary Moore, Strange advance in Alabama GOP primary Alabama GOP Senate primary: live results 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. ButterfieldBlack lawmakers say Confederate statues should come out of Capitol Federal judges order new North Carolina district lines Dems push back against anti-Pelosi insurgents 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 SchweikertFreedom Caucus backs three debt ceiling options Bipartisan lawmakers give blood in honor of Scalise GOP senators pleased with Ivanka Trump meeting on family leave, child tax credits 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.