Nine members of Congress sent a letter to the Drug Enforcement Administration (DEA) on Tuesday, urging the agency to revise its proposed hemp regulations.

DEA released an interim final rule (IFR) for the crop in August, and it said the regulations were simply meant to comply with the 2018 Farm Bill that legalized hemp and its derivatives. But stakeholders and advocates have expressed serious concerns about certain proposals, arguing that they could put processors at risk of violating federal law and hamper the industry’s growth.

Reps. David Joyce (R-OH) and Denver Riggleman (R-VA) led the letter and pointed specifically to a provision of DEA’s IFR that could impact processing hemp extracts. The agency stipulated that “any such material that contains greater than 0.3% of Δ9-THC on a dry weight basis remains controlled in schedule I.”

That’s problematic, the lawmakers said, because in many cases the process of extracting cannabinoids from hemp temporarily causes THC levels to increase beyond that threshold. And so while Congress intended to legalize those extracts, businesses that produce the materials could find themselves inadvertently breaking the law.

“Our offices have received countless calls from constituents involved in the hemp industry who are extremely fearful that simply following the provisions of the Farm Bill will result in criminal liability under the IFR,” the lawmakers’ letter states. “The IFR will likely have the effect of inhibiting these nascent state hemp programs thereby harming those American companies and workers who chose to pursue careers in the hemp industry and made significant investments to effectuate those aspirations.”

Therefore, the lawmakers are “requesting a resolution to this issue as quickly as possible,” adding that “DEA must revise the IFR to eliminate the ambiguities set forth above and provide peace of mind to all Americans who have chosen to pursue a career in the hemp industry.”

Reps. Rodney Davis (R-IL), Morgan Griffith (R-VA), Glenn Grothman (R-WI), Don Young (R-AK), Anthony Gonzalez (R-OH), Earl Blumenauer (D-OR) and Matt Gaetz (R-FL) also signed the letter.

A public comment period on DEA’s proposed rules closed on Tuesday. It saw more than 3,300 submissions, many of which focused on issues with the “work in progress” hemp THC issue.

“This IFR’s criminalizes work in progress hemp extract, a fundamental component of any consumer hemp/CBD product, and will negatively impact the hemp/CBD industry at a time when financial pressure is already high,” one commenter wrote. “Hemp and subsequent extracts are not controlled substances.”

Another issue identified by more than 1,000 commenters concerns delta-8 THC. The most widely known cannabinoid is delta-9 THC, the main component responsible for creating an intoxicating effect, but delta-8 THC from hemp is also psychoactive and is an object of growing interest within the market.

Because DEA’s proposed regulations state that all “synthetically derived tetrahydrocannabinols remain schedule I controlled substances,” some feel that would directly impact the burgeoning cannabinoid, as its converted from CBD through the use of a catalyst—and that could be interpreted as a synthetic production process.

In any case, it’s not clear whether DEA deliberately crafted either of these rules with the intent of criminalizing certain hemp producers—but stakeholders and advocates aren’t taking any chances.

The U.S. Department of Agriculture (USDA) has faced separate criticism over its own proposed hemp rules, though it has been more proactive in addressing them. Following significant pushback from the industry over certain regulations it views as excessively restrictive, the agency reopened a public comment period, which also closed this month.

USDA is also planning to distribute a national survey to gain insights from thousands of hemp businesses that could inform its approach to regulating the market.

Read the congressional coalition’s letter to DEA on its hemp rule below: