"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 BlumenauerDem boycotts of inauguration grow WHIP LIST: More than 60 Dems boycotting Trump's inauguration Pamela Anderson, Mary Matalin to co-host PETA inaugural ball 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 BrooksGOP rep: Sessions attacks part of ‘war on whites’ Ala. governor interviews suspended judge for Sessions's seat Hispanic leader: Trump team talk on immigration 'encouraging' 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. ButterfieldWHIP LIST: More than 60 Dems boycotting Trump's inauguration Overnight Tech: Trump meets with AT&T, Google execs | Pompeo and Wyden battle | Dem's new House E&C roster Overnight Tech: Trump meets AT&T, Google execs | CIA nominee grilled on privacy | Court revives lawsuit over Apple apps | Trump team takes credit for Amazon jobs 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 SchweikertDems launch early '18 attacks on GOP Senate targets Republicans add 13 members to Financial Services, Ways and Means committees The Hill's 12:30 Report 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.