"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 BlumenauerFearing crackdown, marijuana advocates turn to Congress House Democrat introduces bill to amend presidential removal procedures Marijuana legalization grows closer with Senate tax proposal 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 BrooksThe Hill's Whip List: Who to watch on GOP's new ObamaCare bill Freedom Caucus gets to yes on healthcare Centrists push back on new ObamaCare repeal plan 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. ButterfieldOvernight Tech: Lawmakers clash over privacy repeal | FCC gets new office on economic data | Facebook cracks down on revenge porn Overnight Tech: New office at the FCC | Lawmakers get feisty over privacy at hearing | Facebook cracks down on revenge porn FCC defends not fighting legal challenge to prison call rates 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 SchweikertGOP amendment would give billion to insurers to cover high-cost patients Meadows: Freedom Caucus would back bill that got rid of 3 ObamaCare regs Trump pressing House GOP for tweaks in healthcare bill: 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.